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

drizzle/meta/_journal.json

@@ -1,5 +1,13 @@
 {
   "version": "7",
-  "dialect": "sqlite",
-  "entries": []
+  "dialect": "postgresql",
+  "entries": [
+    {
+      "idx": 0,
+      "version": "7",
+      "when": 1784889026419,
+      "tag": "0000_first_mauler",
+      "breakpoints": true
+    }
+  ]
 }