chore(branding): rebrand FixMate to CityPulse across codebase

- Update product name in README, backend docs, and design tokens
- Rename Flutter root widget to CityPulseApp and update tests
- Update dashboard brand strings and HTML title
- Refresh i18n strings (en/ms) and welcome taglines
- Adjust backend API title/description and root message
- Minor formatting in ApiService comments; no logic changes
- Update Android/iOS manifest comments and pubspec description

No API endpoints or response schema changes.

lib/main.dart

@@ -4,21 +4,21 @@ import 'app.dart';
 import 'l10n/i18n.dart';
 import 'l10n/locale_provider.dart';
 export 'app.dart';
- 
+
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
- 
+
   // Initialize locale provider
   final localeProvider = LocaleProvider();
   await localeProvider.init();
- 
+
   // Initialize i18n with the current locale
   await I18n.init(localeProvider.locale);
- 
+
   runApp(
     ChangeNotifierProvider.value(
       value: localeProvider,
-      child: const FixMateApp(),
+      child: const CityPulseApp(),
     ),
   );
 }