### 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

- [x] Documentation Update
- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

### 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

- [x] Documentation Update

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

### What problem does this PR solve?

Update version to v0.3.1

### Type of change

- [x] Documentation Update

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

### What problem does this PR solve?

### Type of change

- [x] Refactoring

### What problem does this PR solve?

### Type of change


- [x] Refactoring

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

### What problem does this PR solve?

The docker-compose file can't config minio related port by .env file. So
I just add env `MINIO_CONSOLE_PORT=9001
MINIO_PORT=9000` to .env file.

### Type of change

- [x] Refactoring

* clean rust version project

* clean rust version project

* build python version rag-flow

* add field progress msg into docinfo; add file processing procedure

* go through upload, create kb, add doc to kb

* smoke test for all API

* smoke test for all API