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

test-pg-connection.ts

@@ -0,0 +1,26 @@
+import "dotenv/config";
+import { Pool } from "pg";
+
+const connectionString = process.env.DATABASE_URL;
+console.log("Testing connection to:", connectionString?.replace(/:[^:]*@/, ":***@"));
+
+async function testConnection() {
+  const pool = new Pool({
+    connectionString,
+    connectionTimeoutMillis: 10000,
+    statement_timeout: 10000,
+  });
+
+  try {
+    const result = await pool.query("SELECT NOW()");
+    console.log("✅ Connection successful!");
+    console.log("✅ Query result:", result.rows[0]);
+    await pool.end();
+    process.exit(0);
+  } catch (error) {
+    console.error("❌ Connection failed:", error instanceof Error ? error.message : String(error));
+    process.exit(1);
+  }
+}
+
+testConnection();