feat: migrate from PocketBase to PostgreSQL with Drizzle ORM

- Add @project-e/db package with Drizzle schema and migrations
- Replace PocketBase client with PostgreSQL-based database client
- Migrate auth from custom to NextAuth.js
- Add Docker Compose with PostgreSQL container
- Update worker to use new database client
- Remove PocketBase-specific files and migrations
- Add drizzle config and initial migration

.env.example

@@ -1,9 +1,14 @@
 # Project E Environment Configuration
 # Copy this file to .env and fill in the values
 
-# PocketBase Configuration
-POCKETBASE_URL=http://db:8090
-POCKETBASE_ADMIN_TOKEN=your-secure-random-token-here
+# PostgreSQL Configuration
+POSTGRES_PASSWORD=replace-with-a-long-random-password
+DATABASE_URL=postgresql://project_e:replace-with-a-long-random-password@localhost:5432/project_e
+
+# Authentication
+NEXTAUTH_SECRET=replace-with-a-long-random-secret
+INITIAL_ADMIN_EMAIL=admin@example.com
+INITIAL_ADMIN_PASSWORD=replace-with-a-long-random-password
 
 # Application Configuration
 NODE_ENV=production