[CRITICAL] Schema missing mood and sleep tables - frontend calls 404

Frontend calls POST /log_mood, POST /log_sleep, GET /get_mood_entries, GET /get_sleep_entries but no such tables exist in schema.sql and no routes exist. Entire mood and sleep tracking features are broken.\n\nFiles: Frontend/src/services/RAGService.js, ActionExecutor.js, AnalyticsService.js\nFix: Create mood and sleep tables in schema.sql and implement Backend/routes/mood.py and sleep.py