refactor: Remove dead HandleTestExistingNode function

This function was superseded by HandleTestNode which is wired to the
router at /api/config/nodes/{id}/test. The old function was not
registered in the router and served no purpose.

Removes 121 lines of unused code.

internal/api/config_handlers.go

@@ -2329,129 +2329,6 @@ func (h *ConfigHandlers) triggerPVEHostCleanup(host string) {
 		Msg("Queued PVE host cleanup via sensor proxy")
 }
 
-// HandleTestExistingNode tests a connection for an existing node using stored credentials
-func (h *ConfigHandlers) HandleTestExistingNode(w http.ResponseWriter, r *http.Request) {
-	nodeID := strings.TrimPrefix(r.URL.Path, "/api/config/nodes/")
-	nodeID = strings.TrimSuffix(nodeID, "/test")
-	if nodeID == "" {
-		http.Error(w, "Node ID required", http.StatusBadRequest)
-		return
-	}
-
-	// Parse node ID
-	parts := strings.Split(nodeID, "-")
-	if len(parts) != 2 {
-		http.Error(w, "Invalid node ID", http.StatusBadRequest)
-		return
-	}
-
-	nodeType := parts[0]
-	index := 0
-	if _, err := fmt.Sscanf(parts[1], "%d", &index); err != nil {
-		http.Error(w, "Invalid node ID", http.StatusBadRequest)
-		return
-	}
-
-	// Get the node configuration
-	var host, user, password, tokenName, tokenValue, fingerprint string
-	var verifySSL bool
-
-	if nodeType == "pve" && index < len(h.config.PVEInstances) {
-		pve := h.config.PVEInstances[index]
-		host = pve.Host
-		user = pve.User
-		password = pve.Password
-		tokenName = pve.TokenName
-		tokenValue = pve.TokenValue
-		fingerprint = pve.Fingerprint
-		verifySSL = pve.VerifySSL
-	} else if nodeType == "pbs" && index < len(h.config.PBSInstances) {
-		pbs := h.config.PBSInstances[index]
-		host = pbs.Host
-		user = pbs.User
-		password = pbs.Password
-		tokenName = pbs.TokenName
-		tokenValue = pbs.TokenValue
-		fingerprint = pbs.Fingerprint
-		verifySSL = pbs.VerifySSL
-	} else {
-		http.Error(w, "Node not found", http.StatusNotFound)
-		return
-	}
-
-	// Test the connection based on type
-	if nodeType == "pve" {
-		clientConfig := proxmox.ClientConfig{
-			Host:        host,
-			User:        user,
-			Password:    password,
-			TokenName:   tokenName,
-			TokenValue:  tokenValue,
-			VerifySSL:   verifySSL,
-			Fingerprint: fingerprint,
-		}
-
-		tempClient, err := proxmox.NewClient(clientConfig)
-		if err != nil {
-			http.Error(w, sanitizeErrorMessage(err, "create_client"), http.StatusBadRequest)
-			return
-		}
-
-		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-		defer cancel()
-
-		nodes, err := tempClient.GetNodes(ctx)
-		if err != nil {
-			http.Error(w, sanitizeErrorMessage(err, "connection"), http.StatusBadRequest)
-			return
-		}
-
-		response := map[string]interface{}{
-			"status":    "success",
-			"message":   fmt.Sprintf("Successfully connected to %d node(s)", len(nodes)),
-			"nodeCount": len(nodes),
-		}
-
-		w.Header().Set("Content-Type", "application/json")
-		json.NewEncoder(w).Encode(response)
-	} else {
-		// PBS test
-		clientConfig := pbs.ClientConfig{
-			Host:        host,
-			User:        user,
-			Password:    password,
-			TokenName:   tokenName,
-			TokenValue:  tokenValue,
-			VerifySSL:   verifySSL,
-			Fingerprint: fingerprint,
-		}
-
-		tempClient, err := pbs.NewClient(clientConfig)
-		if err != nil {
-			http.Error(w, sanitizeErrorMessage(err, "create_client"), http.StatusBadRequest)
-			return
-		}
-
-		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-		defer cancel()
-
-		datastores, err := tempClient.GetDatastores(ctx)
-		if err != nil {
-			http.Error(w, sanitizeErrorMessage(err, "connection"), http.StatusBadRequest)
-			return
-		}
-
-		response := map[string]interface{}{
-			"status":         "success",
-			"message":        fmt.Sprintf("Successfully connected. Found %d datastore(s)", len(datastores)),
-			"datastoreCount": len(datastores),
-		}
-
-		w.Header().Set("Content-Type", "application/json")
-		json.NewEncoder(w).Encode(response)
-	}
-}
-
 // HandleTestNodeConfig tests a node connection from provided configuration
 func (h *ConfigHandlers) HandleTestNodeConfig(w http.ResponseWriter, r *http.Request) {
 	var req NodeConfigRequest