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.

ios/Runner/Info.plist

@@ -46,7 +46,7 @@
 	<key>UIApplicationSupportsIndirectInputEvents</key>
 	<true/>
 
-	<!-- Permissions required by FixMate -->
+	<!-- Permissions required by CityPulse -->
 	<key>NSCameraUsageDescription</key>
 	<string>Camera access is required to capture issue photos.</string>
 	<key>NSPhotoLibraryUsageDescription</key>