Refactor: Codebase cleanup and modularization
- Remove outdated documentation files (7 files)
- Remove deprecated code (database.ts, authController.ts, auth.ts)
- Extract constants to backend/src/config/constants.ts
- Consolidate shared types (processing, llm, document, job)
- Create LLM modularization structure:
- llmPrompts/ directory for prompt builders
- llmProviders/ directory for provider implementations
- llmUtils/ directory for utility functions
- Extract common error handling patterns to errorHandlers.ts
- Organize scripts into subdirectories (monitoring/, testing/, debugging/, setup/)
- Update README.md with current documentation references
All functionality preserved, structure improved for maintainability.
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