Add try-catch to login.php for detailed error debugging

backend/login.php

@@ -23,6 +23,7 @@ if (empty($username) || empty($password)) {
     exit;
 }
 
+try {
     $stmt = $c->prepare("SELECT id, username, password FROM users WHERE username = ?");
     $stmt->bind_param("s", $username);
     $stmt->execute();
@@ -39,3 +40,11 @@ if ($row = $result->fetch_assoc()) {
     }
 
     echo json_encode(['status' => 'error', 'message' => 'Invalid username or password']);
+} catch (mysqli_sql_exception $e) {
+    http_response_code(500);
+    echo json_encode([
+        'status' => 'error', 
+        'message' => 'Terjadi kesalahan query database',
+        'error_detail' => $e->getMessage()
+    ]);
+}