### What problem does this PR solve?

Add a LLM provider: PPIO

### Type of change

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

### What problem does this PR solve?

#4929

### Type of change

- [x] Performance Improvement

### What problem does this PR solve?

#4995

### Type of change

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

### What problem does this PR solve?

Fix knowledge graph node not found (#4968)

### Type of change

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

### What problem does this PR solve?

**#4983**

### Type of change

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

### What problem does this PR solve?

Added PEP 723 metadata to download_deps.py

### Type of change

- [x] Refactoring

### What problem does this PR solve?

Feat: Add background color to GraphRag configuration #4980

### Type of change


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

### What problem does this PR solve?

Feat: Add ParsedPageCard component #3221
### Type of change


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

add gemini-2.0-flash-thinking-exp-01-21

### What problem does this PR solve?
Feat: Jump from the chunk page to the dataset page #3221

### Type of change


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

format number float

### What problem does this PR solve?

#4126

### Type of change

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

### What problem does this PR solve?

#4940

### Type of change

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

### What problem does this PR solve?

Feat: Add an id to the dataset testing route #3221

### Type of change


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

### 🛠 Fixes `KeyError: 'content'` when using `stream=False`

#### 🔍 Problem  
When calling the chat API with `stream=False`, the code attempts to
access `msg[-1]["content"]` without verifying if the key exists. This
causes a `KeyError` when the message structure does not contain
`"content"`.

This issue was discussed in
[#4885](https://github.com/infiniflow/ragflow/issues/4885), where we
analyzed the root cause. The error does not occur with `stream=True`, as
the response is processed differently.

#### ✅ Solution  
- **Logging Fix:**  
  - Before accessing `msg[-1]["content"]`, we check if the key exists.  
- If it does not exist, a default value (`"[content not available]"`) is
used to prevent errors.

- **Structural Fix in `msg` Construction:**  
- Ensured that every message in `msg` contains the `"content"` key, even
if empty.
- This fixes the issue at its root and ensures consistent behavior
between `stream=True` and `stream=False`.

#### 🔄 Impact  
- Prevents the `KeyError` without affecting normal application flow.  
- Ensures the integrity of the `msg` structure, avoiding future
failures.



### Type of change

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

### What problem does this PR solve?

Feat: Bind data to datasets page #3221

### 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?

Feat: Display Think for Deepseek R1 model #4903

### Type of change

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

### What problem does this PR solve?

### Type of change

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

### What problem does this PR solve?

Feat: Add ChatInput component #3221

### Type of change


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

### What problem does this PR solve?

#4870 
### Type of change

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

### What problem does this PR solve?

#4870

### Type of change

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

### What problem does this PR solve?

Fix: After deleting all conversation lists, the chat input box can still
be used for input. #4907

### Type of change

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

### What problem does this PR solve?

Feat: Add LlmSettingFieldItems component #3221

### Type of change


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

### What problem does this PR solve?
#4903
### Type of change

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

Use `json.loads()` instead.

### What problem does this PR solve?

Using `eval()` can lead to code injections. I think this loads a JSON
field, right? If yes, why is this done via `eval()` and not
`json.loads()`?

### Type of change

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

### What problem does this PR solve?

#4831

### Type of change

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

Use `np.float32()` instead.

### What problem does this PR solve?

Using `eval()` can lead to code injections.

I think `eval()` is only used to parse a floating point number here.
This change preserves the correct behavior if the string `"None"` is
supplied. But if that behavior isn't intended then this part could be
just deleted instead, since `np.float32()` is parsing strings anyway:

```Python
        if isinstance(scale, str):
            scale = eval(scale)
```

### Type of change

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

### What problem does this PR solve?

if *.xls file is too large, .eg >50M, I get error.

### Type of change

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

### What problem does this PR solve?

Changed elasticsearch image url to speed up image downloading. 

### Type of change

- [x] Refactoring

### What problem does this PR solve?

Fix: Knowledge base page crashes when network connection is lost. #4894
### Type of change

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

### What problem does this PR solve?

Feat: Add hatPromptEngine component #3221

### Type of change


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

### What problem does this PR solve?

Feat: Add ChatBasicSetting component #3221

### Type of change


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

### What problem does this PR solve?

Fix categorize agent input content not format error

### Type of change

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

Co-authored-by: wangrui <wangrui@haima.me>

### What problem does this PR solve?

Feat: Add Sessions component #3221

### Type of change


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

### What problem does this PR solve?


### Type of change

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

### What problem does this PR solve?
Feat: Add  ChatCard #3221

### 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?

Feat: Modify the Preset configurations item style to distinguish it from
other fields #4844

### Type of change


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

### What problem does this PR solve?

#4828

### Type of change

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

### What problem does this PR solve?

Fix: Fail to open console with Firefox #4816

### Type of change

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

### What problem does this PR solve?

#4760

### Type of change

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

### What problem does this PR solve?

Feat: Remove begin's width from agent templates #4764
### Type of change


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

### What problem does this PR solve?

Feat: Fixed the issue where the prompt always displayed the initial
value when switching between different generate operators #4764

### Type of change


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

### What problem does this PR solve?

Feat: Add VariablePickerMenuPlugin to select variables in the prompt
text box by menu #4764

### Type of change


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

### What problem does this PR solve?

#4764

### Type of change

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

### What problem does this PR solve?

Fix: The requested interface timeout will cause the page to crash #4787

### Type of change

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

### What problem does this PR solve?

#4749

### Type of change

- [x] Performance Improvement

### What problem does this PR solve?

#4779

### Type of change

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

### What problem does this PR solve?
#4775

### Type of change

- [x] Documentation Update