Implement network switching improvements for HMAC file server

- Added support for chunked and resumable uploads to enhance resilience against network interruptions.
- Introduced a new upload session management system to track progress and handle retries.
- Enhanced connection management with improved timeout settings for mobile networks.
- Implemented network change detection and handling to pause and resume uploads seamlessly.
- Developed client-side retry logic for uploads to improve reliability.
- Updated configuration options to enable new features and set recommended defaults for timeouts and chunk sizes.
- Created integration layer to add new features without modifying existing core functionality.
- Established a network resilience manager to monitor network changes and manage active uploads.

cmd/server/helpers.go

@@ -602,6 +602,12 @@ func setupRouter() *http.ServeMux {
 	})
 
 	log.Info("HTTP router configured successfully with full protocol support (v, v2, token, v3)")
+	
+	// Enhance router with network resilience features (non-intrusive)
+	if conf.Uploads.ChunkedUploadsEnabled {
+		EnhanceExistingRouter(mux)
+	}
+	
 	return mux
 }