feat: Implement core application dashboard, add todo and task management API, and include database testing utilities.

test-db.js

@@ -0,0 +1,10 @@
+const { pool } = require('./config/database');
+pool.query('SELECT 1', (err, res) => {
+  if (err) {
+    console.error('DB Connection Error:', err);
+    process.exit(1);
+  } else {
+    console.log('DB Connection Success');
+    process.exit(0);
+  }
+});