feat(*): Migrate from MongoDB to unified Supabase PostgreSQL architecture

supabase/seed.sql

@@ -0,0 +1,14 @@
+-- Initial seed data for local development
+-- This file is referenced in config.toml and will be loaded during db reset
+
+-- Note: RLS is already enabled on auth.users by default in Supabase
+-- No need to modify system tables here
+
+-- Add any application-specific seed data here
+-- For now, this file is minimal since we use MongoDB for app data
+
+-- Example: If we had a profiles table, we could seed it here
+-- INSERT INTO profiles (id, username) VALUES 
+-- ('test-user-id', 'testuser');
+
+SELECT 'Local Supabase setup complete' as message;