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

list-databases.ts

@@ -0,0 +1,28 @@
+import "dotenv/config";
+import { Pool } from "pg";
+
+async function listDatabases() {
+  // Connect to default postgres database first
+  const pool = new Pool({
+    host: "ep-long-glitter-ao3sjoyu-pooler.c-2.ap-southeast-1.aws.neon.tech",
+    port: 5432,
+    user: "neondb_owner",
+    password: "npg_2ziHMPwZCet9",
+    database: "postgres",
+    connectionTimeoutMillis: 10000,
+    ssl: { rejectUnauthorized: false },
+  });
+
+  try {
+    const result = await pool.query("SELECT datname FROM pg_database WHERE datistemplate = false ORDER BY datname;");
+    console.log("✅ Available databases:");
+    result.rows.forEach((row: any) => {
+      console.log(`  - ${row.datname}`);
+    });
+    await pool.end();
+  } catch (error) {
+    console.error("❌ Error:", error instanceof Error ? error.message : String(error));
+  }
+}
+
+listDatabases();