### What problem does this PR solve?
Hello, I encountered a problem when trying to use a S3 backend
(seaweedfs) for storage in RAGFlow: when calling
`STORAGE_IMPL.get("bucket", "key")`, the actual request sent to S3 is
`bucket/bucket/key`, causing a `NoSuchKey` error.
I compared the code in `s3_conn.py` to `minio_conn.py` and
`oss_conn.py`, then decided to remove the `else` branch in
`use_prefix_path` method, and it works. I didn't configure `prefix_path`
or `bucket` in `s3` section of the `service_conf.yaml`.
I think this is a bug, but not sure.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):
### What problem does this PR solve?
- Added support for S3-compatible protocols.
- Enabled the use of knowledge base ID as a file prefix when storing
files in S3.
- Updated docker/README.md to include detailed S3 and OSS configuration
instructions.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
- Bring `STORAGE_IMPL` back in `rag/svr/cache_file_svr.py`
- Simplify storage connection when working with AWS S3
### Type of change
- [x] Refactoring
### What problem does this PR solve?
Fix the issue when retrieving AWS credentials from the S3 configuration
from the settings module instead of getting from the environment
variables.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>
### What problem does this PR solve?
Use consistent log file names, introduced initLogger
### Type of change
- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [x] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):
### What problem does this PR solve?
issue: https://github.com/infiniflow/ragflow/issues/2277
_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._
### Type of change
- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>
