### What problem does this PR solve?

- Update version tags in README files (including translations) from
v0.20.3 to v0.20.4
- Modify Docker image references and documentation to reflect new
version
- Update version badges and image descriptions
- Maintain consistency across all language variants of README files

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

Bump infinity-sdk dependency to the latest development version
(0.6.0.dev5) in both pyproject.toml and uv.lock files to incorporate
recent changes and fixes from the SDK.

### Type of change

- [x] Other (please describe): Update deps

### What problem does this PR solve?

- Update version tags in README files (including translations) from
v0.20.2 to v0.20.3
- Modify Docker image references and documentation to reflect new
version
- Update version badges and image descriptions
- Maintain consistency across all language variants of README files

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

- Update version tags in README files (including translations) from
v0.20.1 to v0.20.2
- Modify Docker image references and documentation to reflect new
version
- Update version badges and image descriptions
- Maintain consistency across all language variants of README files

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

- Update httpx dependency to include socks support in pyproject.toml
- Update lockfile with new socksio dependency

### Type of change

- [x] Update dependencies for proxy support

### What problem does this PR solve?

Add SMTP support for user invitation emails

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

#3951
#8463 

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

add fallback to `calamine` engine when parse error raised using the
default `openpyxl` / `xlrd` engine.
e.g. the following error can be fixed:
```
Traceback (most recent call last):
  File "/ragflow/deepdoc/parser/excel_parser.py", line 53, in _load_excel_to_workbook
    df = pd.read_excel(file_like_object)
  File "/ragflow/.venv/lib/python3.10/site-packages/pandas/io/excel/_base.py", line 495, in read_excel
    io = ExcelFile(
  File "/ragflow/.venv/lib/python3.10/site-packages/pandas/io/excel/_base.py", line 1567, in __init__
    self._reader = self._engines[engine](
  File "/ragflow/.venv/lib/python3.10/site-packages/pandas/io/excel/_xlrd.py", line 46, in __init__
    super().__init__(
  File "/ragflow/.venv/lib/python3.10/site-packages/pandas/io/excel/_base.py", line 573, in __init__
    self.book = self.load_workbook(self.handles.handle, engine_kwargs)
  File "/ragflow/.venv/lib/python3.10/site-packages/pandas/io/excel/_xlrd.py", line 63, in load_workbook
    return open_workbook(file_contents=data, **engine_kwargs)
  File "/ragflow/.venv/lib/python3.10/site-packages/xlrd/__init__.py", line 172, in open_workbook
    bk = open_workbook_xls(
  File "/ragflow/.venv/lib/python3.10/site-packages/xlrd/book.py", line 68, in open_workbook_xls
    bk.biff2_8_load(
  File "/ragflow/.venv/lib/python3.10/site-packages/xlrd/book.py", line 641, in biff2_8_load
    cd.locate_named_stream(UNICODE_LITERAL(qname))
  File "/ragflow/.venv/lib/python3.10/site-packages/xlrd/compdoc.py", line 398, in locate_named_stream
    result = self._locate_stream(
  File "/ragflow/.venv/lib/python3.10/site-packages/xlrd/compdoc.py", line 429, in _locate_stream
    raise CompDocError("%s corruption: seen[%d] == %d" % (qname, s, self.seen[s]))
xlrd.compdoc.CompDocError: Workbook corruption: seen[2] == 4
```

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

All models pass the mock response tests, which means that if a model can
return the correct response, everything should work as expected.
However, not all models have been fully tested in a real environment,
the real API_KEY. I suggest actively monitoring the refactored models
over the coming period to ensure they work correctly and fixing them
step by step, or waiting to merge until most have been tested in
practical environment.

### Type of change

- [x] Refactoring

### What problem does this PR solve?

- Update version tags in README files (including translations) from
v0.20.0 to v0.20.1
- Modify Docker image references and documentation to reflect new
version
- Update version badges and image descriptions
- Maintain consistency across all language variants of README files

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

- Update version tags in README files (including translations) from
v0.19.1 to v0.20.0
- Modify Docker image references and documentation to reflect new
version
- Update version badges and image descriptions
- Maintain consistency across all language variants of README files

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

#9082 #6365

<u> **WARNING: it's not compatible with the older version of `Agent`
module, which means that `Agent` from older versions can not work
anymore.**</u>

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Bump to infinity v0.6.0-dev4.
WARNNING: infinity v0.6.0-dev4 has very different meta data format with
older versions. You have to destroy infinity data volume are restart
infinity container if there's existing data.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [x] Refactoring
- [x] Performance Improvement
- [ ] Other (please describe):

Signed-off-by: zhanluxianshen <zhanluxianshen@163.com>

### What problem does this PR solve?

Upgrade MCP SDK to v1.9.4 (latest).

### Type of change

- [x] Refactoring

### What problem does this PR solve?

- Update Docker image version badges and references from v0.19.0 to
v0.19.1
- Modify version mentions in all localized README files (id, ja, ko,
pt_br, tzh, zh)
- Update version in docker/README.md and related documentation files
- Includes updates to Helm values and Python SDK dependencies

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

#8074
Oss support opendal(including mysql)

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

### What problem does this PR solve?

Move test cases only - CI still runs tests under sdk/python

### Type of change

- [x] Refactoring

### What problem does this PR solve?

sync test group from sdk/python/pyproject.toml to top pyproject.toml

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

There are two main changes:

1. Update xgboost to 1.6.0 to build the project on MacOS with Apple
chips, this change refers to the issue:
https://github.com/infiniflow/ragflow/issues/5114.

2. When `use_china_mirrors` is set in `download_deps.py`, the names of
chrome files downloaded by the script will be different from the file
names used in Dockerfile, so I added the file name in `get_urls`
function to solve this problem.

I think it's better to add testing for Docker image
`infiniflow/ragflow_deps` to the test workflow, but since the workflow
is currently running on a self-hosted runner, I'm not sure how to modify
it.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

### What problem does this PR solve?

update for v0.19.0

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

Hello, our use case requires LLM agent to invoke some tools, so I made a
simple implementation here.

This PR does two things:

1. A simple plugin mechanism based on `pluginlib`:

This mechanism lives in the `plugin` directory. It will only load
plugins from `plugin/embedded_plugins` for now.

A sample plugin `bad_calculator.py` is placed in
`plugin/embedded_plugins/llm_tools`, it accepts two numbers `a` and `b`,
then give a wrong result `a + b + 100`.

In the future, it can load plugins from external location with little
code change.

Plugins are divided into different types. The only plugin type supported
in this PR is `llm_tools`, which must implement the `LLMToolPlugin`
class in the `plugin/llm_tool_plugin.py`.
More plugin types can be added in the future.

2. A tool selector in the `Generate` component:

Added a tool selector to select one or more tools for LLM:


![image](https://github.com/user-attachments/assets/74a21fdf-9333-4175-991b-43df6524c5dc)

And with the `bad_calculator` tool, it results this with the `qwen-max`
model:


![image](https://github.com/user-attachments/assets/93aff9c4-8550-414a-90a2-1a15a5249d94)


### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

Co-authored-by: Yingfeng <yingfeng.zhang@gmail.com>

TOML-table-based project.license is deprecated as per PEP 639, see:
https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license-and-license-files

### What problem does this PR solve?

The following error when building project (e.g. `uv build`)

```
SetuptoolsDeprecationWarning: `project.license` as a TOML table is deprecated
!!

        ********************************************************************************
        Please use a simple string containing a SPDX expression for `project.license`. You can also use `project.license-files`. (Both options available on setuptools>=77.0.0).

        By 2026-Feb-18, you need to update your project and remove deprecated calls
        or your builds will no longer be supported.

        See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
        ********************************************************************************

!!
```

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

### What problem does this PR solve?
For `uv package`/`uv pip install ".[full]"`, bug introduced in #6370:

* Removes erroneous (non-package) directories (`helm`, `flask_session`)
* Adds `mcp.server` package
* Resolves "warning: package would be ignored" ambiguity by changing
`sdk` to `sdk.python.ragflow_sdk`
* Resolves "error: package directory 'intergrations' does not exist" by
including `intergrations.chatgpt-on-wechat.plugins` explicitly
* Also rearranges packages in alphabetical order, for DX.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

### What problem does this PR solve?

This PR adds the support for latest OpenSearch2.19.1 as the store engine
& search engine option for RAGFlow.

### Main Benefit

1. OpenSearch2.19.1 is licensed under the [Apache v2.0 License] which is
much better than Elasticsearch
2. For search, OpenSearch2.19.1 supports full-text
search、vector_search、hybrid_search those are similar with Elasticsearch
on schema
3. For store, OpenSearch2.19.1 stores text、vector those are quite
simliar with Elasticsearch on schema

### Changes

- Support opensearch_python_connetor. I make a lot of adaptions since
the schema and api/method between ES and Opensearch differs in many
ways(especially the knn_search has a significant gap) :
rag/utils/opensearch_coon.py
- Support static config adaptions by changing:
conf/service_conf.yaml、api/settings.py、rag/settings.py
- Supprt some store&search schema changes between OpenSearch and ES:
conf/os_mapping.json
- Support OpenSearch python sdk : pyproject.toml
- Support docker config for OpenSearch2.19.1 :
docker/.env、docker/docker-compose-base.yml、docker/service_conf.yaml.template

### How to use
- I didn't change the priority that ES as the default doc/search engine.
Only if in docker/.env , we set DOC_ENGINE=${DOC_ENGINE:-opensearch}, it
will work.


### Others
Our team tested a lot of docs in our environment by using OpenSearch as
the vector database ,it works very well.
All the conifg for OpenSearch is necessary.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Yongteng Lei <yongtengrey@outlook.com>
Co-authored-by: writinwaters <93570324+writinwaters@users.noreply.github.com>
Co-authored-by: Yingfeng <yingfeng.zhang@gmail.com>

### What problem does this PR solve?

update for v0.18.0

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

Add MCP support with a client example.

Issue link: #4344

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Removed set_entity and set_relation to avoid accessing doc engine during
graph computation.
Introduced GraphChange to avoid writing unchanged chunks.

### Type of change

- [x] Performance Improvement

### What problem does this PR solve?

#6155

Add basic Langfuse support for LLM module.

A trace example:

<img width="755" alt="image"
src="https://github.com/user-attachments/assets/25c1f852-5116-486c-a47f-6097187142ca"
/>


### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

This PR resolves the issue of multiple top-level packages being detected
in the Python project, which caused errors when using uv pip install.
The problem occurred because the project had multiple directories files
at the root level, leading to a flat-layout error.
To fix this, the pyproject.toml file was updated to explicitly list the
packages using the [tool.setuptools] section. This ensures that the
correct packages are included during installation, avoiding the
flat-layout error.
Type of change

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

Unify Ruff config and enable async checks (ASYNC, TRIO)

### Type of change

- [x] CI/CD or tooling improvement

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

### What problem does this PR solve?

Made task_executor async to speedup parsing

### Type of change

- [x] Performance Improvement

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

---------

Co-authored-by: Jin Hai <haijin.chn@gmail.com>

### What problem does this PR solve?

This patch drop useless fastext which is seems useless in the code base 
and its very kind of hard install
should close #4498


### Type of change

- [x] Refactoring

Signed-off-by: yihong0618 <zouzou0208@gmail.com>

### What problem does this PR solve?

#5198

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

### What problem does this PR solve?

Added cuda_is_available

### Type of change

- [x] Refactoring

### What problem does this PR solve?

Fixed GPU detection on CPU only environment. Close #4692

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

Fix onnxruntime-gpu marks

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

Removed onnxruntime. It conflicts with the onnxruntime-gpu.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

Added onnxruntime-gpu

### Type of change

- [x] Refactoring

### What problem does this PR solve?

#4543

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Bump akshare. Close #4525 

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

Bump infinity to v0.6.0-dev2. Close #4477 

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

Replace poetry with uv

### Type of change

- [x] Refactoring

### What problem does this PR solve?

Bump infinity to v0.6.0-dev1 and poetry to 2.0.1

### Type of change

- [x] Refactoring

### What problem does this PR solve?

duckduckgo search 6.3.0 still has error sometimes, need to update to
7.2.0, after updated, it works ok.
this PR is going to fix this issue
https://github.com/infiniflow/ragflow/issues/4396

### Type of change

 Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: xiaohzho <xiaohzho@cisco.com>

this PR is going to fix issue
https://github.com/infiniflow/ragflow/issues/4396

### Type of change

 Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: xiaohzho <xiaohzho@cisco.com>