feat: Enhance frontend loading experience and service status handling

### Summary of Changes
- Removed proxy configuration in `rsbuild.config.js` as the API Gateway is not running.
- Added smooth transitions and gentle loading overlays in CSS for improved user experience during data loading.
- Updated `Dashboard` component to conditionally display loading spinner and gentle loading overlay based on data fetching state.
- Enhanced `useOfflineAwareServiceStatus` and `useOfflineAwareSystemData` hooks to manage loading states and service status more effectively.
- Increased refresh intervals for service status and system data to reduce API call frequency.

### Expected Results
- Improved user experience with smoother loading transitions and better feedback during data refreshes.
- Enhanced handling of service status checks, providing clearer information when services are unavailable.
- Streamlined code for managing loading states, making it easier to maintain and extend in the future.

frontend/src/utils/errorHandling.js

@@ -41,9 +41,10 @@ export const formatServiceData = (serviceData) => {
   }
   
   return Object.entries(serviceData).map(([key, service]) => ({
-    name: service.name || key,
-    status: service.status === 'healthy' ? 'online' : 'offline',
-    uptime: service.responseTime || '0d 0h'
+    name: service.name || key.charAt(0).toUpperCase() + key.slice(1).replace('_', ' '),
+    status: service.status === 'healthy' ? 'online' : 
+            service.status === 'unknown' ? (service.enabled ? 'offline' : 'disabled') : 'offline',
+    uptime: service.uptime || '0d 0h'
   }));
 };