feat: configure postgresql as primary database with neon connection

- Updated .env to use PostgreSQL (neondb) instead of SQLite
- Updated drizzle.ts to support DATABASE_URL connection string
- Regenerated migrations for PostgreSQL syntax
- Bot successfully connects and operates with PostgreSQL
- All database operations working correctly

drizzle/migrations/meta/_journal.json

@@ -1,12 +1,12 @@
 {
   "version": "7",
-  "dialect": "sqlite",
+  "dialect": "postgresql",
   "entries": [
     {
       "idx": 0,
-      "version": "6",
-      "when": 1778747576917,
-      "tag": "0000_windy_victor_mancha",
+      "version": "7",
+      "when": 1778750697764,
+      "tag": "0000_rare_kitty_pryde",
       "breakpoints": true
     }
   ]