Fix: Optimized the get_by_id method to resolve the issue of missing
exceptions and improve query performance
### What problem does this PR solve?
Optimized the get_by_id method to resolve the issue of missing
exceptions and improve query performance.
Optimization details:
1. The original method used a custom query method that required
concatenating SQL, which impacted performance.
2. The query method returned a list, which needed to be accessed by
index, posing a risk of index out-of-bounds errors.
3. The original method used except Exception to catch all errors, which
is not a best practice in Python programming and may lead to missing
exceptions. The get_or_none method accurately catches DoesNotExist
errors while allowing other errors to be raised normally.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
- [x] Performance Improvement
### What problem does this PR solve?
- The API documentation lacks detailed error code explanations. Added
error code tables to `python_api_reference.md` and
`http_api_reference.md` to clarify possible error codes and their
meanings.
- Error handling in the codebase is inconsistent. Standardized error
handling logic in `sdk/python/ragflow_sdk/modules/chunk.py`.
- Improved API comments by adding standardized docstrings to enhance
code readability and maintainability.
### Type of change
- [x] Documentation Update
- [x] Refactoring
### What problem does this PR solve?
Related source file is in Windows/DOS format, they are format to Unix
format.
### Type of change
- [x] Refactoring
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
