### What problem does this PR solve?

- Update version tags in README files (including translations) from
v0.19.1 to v0.20.0
- Modify Docker image references and documentation to reflect new
version
- Update version badges and image descriptions
- Maintain consistency across all language variants of README files

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

- Update Docker image version badges and references from v0.19.0 to
v0.19.1
- Modify version mentions in all localized README files (id, ja, ko,
pt_br, tzh, zh)
- Update version in docker/README.md and related documentation files
- Includes updates to Helm values and Python SDK dependencies

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

update for v0.19.0

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

### Type of change

- [x] Documentation Update

### What problem does this PR solve?

As RAGFlow has an integration with Langfuse, this docs page shows how to
configure Langfuse tracing.

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [x] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):