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refactor(subsequences)!: clean up codebase, restructure API, and improve backend logic (#6511)

### 📣 Summary
This PR cleans up the subsequences codebase by removing unused/broken
code, restructuring the API with better endpoints, simplifying backend
logic, updating the frontend to use the new API structure, and adding
comprehensive documentation.

### 📖 Description
This comprehensive refactoring addresses multiple aspects of the
subsequences system to improve code quality, API design, and overall
maintainability. The primary focus has been on cleaning up accumulated
technical debt while modernizing the architecture for better long-term
sustainability.

**Code Cleanup and Backend Simplification**

The refactoring begins with a thorough cleanup of the subsequences
codebase, removing significant amounts of dead code, unused functions,
and broken implementations that were no longer serving any purpose.
Complex backend logic has been simplified and streamlined, reducing
unnecessary complexity in data processing workflows. The code quality
improvements include better type annotations, enhanced error handling,
and improved maintainability patterns throughout the entire module.

**Frontend Integration and User Experience**

The frontend components have been thoroughly updated to integrate
seamlessly with the restructured API endpoints, ensuring that users
experience no disruption in functionality while benefiting from improved
performance. The processing workflows for transcription, translation,
and qualitative analysis have been enhanced with better error handling
and more informative user feedback.

**Documentation and Migration Support**

A comprehensive README has been added to the subsequences module,
providing detailed documentation about the new API structure, usage
patterns, and clear guidelines for developers. The documentation
includes a complete API reference with accurate parameter descriptions
and response formats, along with practical examples ... (continued)

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