### What problem does this PR solve?
issue:
https://github.com/infiniflow/ragflow/issues/10427https://github.com/infiniflow/ragflow/issues/8115
change:
- Support for Multiple HTTP Methods (POST / GET / PUT / PATCH / DELETE /
HEAD)
- Security Validation
1. max_body_size
2. IP whitelist
3. rate limit
4. token / basic / jwt authentication
- File Upload Support
- Unified Content-Type Handling
- Full Schema-Based Extraction & Type Validation
- Two Execution Modes: Immediately / Streaming
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Try to make this more asynchronous. Verified in chat and agent
scenarios, reducing blocking behavior. #11551, #11579.
However, the impact of these changes still requires further
investigation to ensure everything works as expected.
### Type of change
- [x] Refactoring
### What problem does this PR solve?
```
admin> show version;
show_version
+-----------------------+
| version |
+-----------------------+
| v0.21.0-241-gc6cf58d5 |
+-----------------------+
admin> \q
Goodbye!
```
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
---------
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
