Centralized Supabase Queries for All Demo Apps

• Moved all Supabase queries into a centralized directory at @/lib/db/queries for cleaner and more maintainable code.

• Introduced dedicated query files:

  • general.ts: Handles general queries like session state and user credits.

  • chat.ts: Manages all queries for the new chat app.

  • generations.ts: Unified logic for GPT-4.0, DALL-E, SDXL, Llama 3.1, Claude 3.5 Sonnet, and xAI Grok apps.

  • audio.ts: Contains all queries for the audio app.

  • pdf.ts: Handles queries for the PDF app.
    
    

This update simplifies data fetching, reduces redundancy, and improves scalability across all 10 demo apps.