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

packages/db/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "@project-e/db",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "exports": {
+    ".": "./src/index.ts",
+    "./schema": "./src/schema.ts"
+  },
+  "dependencies": {
+    "drizzle-orm": "^0.45.1",
+    "postgres": "^3.4.8"
+  }
+}