### What problem does this PR solve?
issue:
[#10296](https://github.com/infiniflow/ragflow/issues/10296)
change:
- ExeSQL: support connecting to Trino.
- Validation: password can be empty only when db_type === "trino";
all other database types keep the existing requirement (non-empty).
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
issue：#5617
change：add IBM DB2 support in ExeSQL
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
This PR fixes incorrect naming for PostgreSQL usage by replacing all
instances of `postgresql` with the correct `postgres` in the `db_type`
field. This resolves potential configuration errors and ensures
consistency when specifying the database type.
Also fixed handling of None for `get_queue_length`
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
Co-authored-by: cucusenok <BP-116: updated readme.md>
### What problem does this PR solve?
Implemented French UI translation
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
---------
Co-authored-by: ramin cedric <>
Co-authored-by: Liu An <asiro@qq.com>
### What problem does this PR solve?
Feat: Add retrieval tool #3221
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
