MCP/Rules Improvements + MCP Prompts (#357)

- Use ESM for building the MCP Server
- Added own Postgres dependency to MCP Server for querying tables and other entities in MCP
- Vastly improved AI Agent rules
- Added MCP Prompts for reviewing code and planning features
- Minor refactoring

packages/supabase/CLAUDE.md

@@ -2,6 +2,23 @@
 
 This file contains instructions for working with Supabase, database security, and authentication.
 
+## Schemas and Migrations ⚠️
+
+**Critical Understanding**: Schema files are NOT automatically applied to the database!
+
+- **Schemas** (`supabase/schemas/`) represent the desired database state (source of truth)
+- **Migrations** (`supabase/migrations/`) are the actual SQL commands that modify the database
+
+### The Required Workflow
+
+1. **Edit schema file** (e.g., `supabase/schemas/18-projects.sql`)
+2. **Generate migration**: `pnpm --filter web supabase:db:diff -f migration_name`
+   - This compares your schema against the current database and creates a migration
+3. **Apply migration**: `pnpm --filter web supabase migration up`
+   - This actually executes the SQL changes in the database
+
+**⚠️ CRITICAL**: Editing a schema file alone does NOTHING to your database. You MUST generate and apply a migration for changes to take effect. Schema files are templates - migrations are the actual database operations.
+
 ## Database Security Guidelines ⚠️
 
 **Critical Security Guidelines - Read Carefully!**
@@ -98,22 +115,8 @@ CREATE POLICY "notes_manage" ON public.notes FOR ALL
   );
 ```
 
-## Schema Management Workflow
-
-1. Create schemas in `apps/web/supabase/schemas/` as `<number>-<name>.sql`
-2. After changes: `pnpm supabase:web:stop`
-3. Run: `pnpm --filter web run supabase:db:diff -f <filename>`
-4. Restart: `pnpm supabase:web:start` and `pnpm supabase:web:reset`
-5. Generate types: `pnpm supabase:web:typegen`
-
 - **Never modify database.types.ts**: Instead, use the Supabase CLI using our package.json scripts to re-generate the types after resetting the DB
 
-### Key Schema Files
-
-- Accounts: `apps/web/supabase/schemas/03-accounts.sql`
-- Memberships: `apps/web/supabase/schemas/05-memberships.sql`
-- Permissions: `apps/web/supabase/schemas/06-roles-permissions.sql`
-
 ## Type Generation
 
 ```typescript
@@ -296,7 +299,7 @@ async function databaseOperation() {
 ## Migration Best Practices
 
 1. Always test migrations locally first
-2. Use transactions for complex migrations
+2. Use transactions for complex operations
 3. Add proper indexes for new columns
 4. Update RLS policies when adding new tables
 5. Generate TypeScript types after schema changes