Somoru 6cde730553 feat: complete multi-user implementation with authentication and documentation
- Update login flow to support multi-user mode with username field
- Fix session type definitions (userId as number/tmpID)
- Add comprehensive MULTI_USER.md documentation covering:
  * Architecture and database schema details
  * Setup instructions and API reference
  * Security implementation (scrypt parameters)
  * Backward compatibility with single-user mode
  * Future enhancements and limitations

All components now properly integrate with existing user_data table
from OAuth migration v229. Zero TypeScript errors.
2025-10-21 14:51:20 +05:30
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