Connect to Supabase Backend

[google-labs-jules]

Connected the application to the user's Supabase project.

• Configured .env with provided credentials.
• Updated src/lib/storage.ts to fetch/save data using Supabase Client instead of localStorage.
• Restored src/lib/supabase.ts to initialize the real client.
• Added SUPABASE_SETUP.md with the necessary SQL commands to create tables and policies.
• Updated admin components to handle asynchronous data loading.

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PR created automatically by Jules for task 6148402678737555039 started by @Gbseca

[google-labs-jules]

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