fix: Distributed API UI & metrics polish + DEP0060 suppression

Add Node modal — type selector & state reset:
- Restored a Local/Remote <Select> dropdown in renderFormFields so users can
  explicitly choose the node type instead of it defaulting silently to 'remote'.
- Switching type clears api_url and api_token so no stale remote credentials
  carry over if a user switches from Remote to Local mid-form.
- Replaced the static "Add Remote Node" title with a dynamic one that reflects
  the currently selected type ("Add Local Node" / "Add Remote Node").
- onOpenChange now resets formData to defaultFormData whenever the dialog
  opens, preventing stale values from a previous session leaking in.

Remote connection details — real metrics:
- testRemoteConnection previously returned hard-coded '-' for containers,
  images, and cpus after a successful auth/check ping.
- Now fires three parallel requests (Promise.allSettled) after auth passes:
    /api/stats          → containers total + running count
    /api/system/stats   → cpu.cores
    /api/system/images  → image list length
- Each field falls back to '-' gracefully if an endpoint is unavailable,
  so a slow or older remote instance never breaks the connection test.

DEP0060 util._extend suppression:
- http-proxy@1.18.1 calls util._extend when createProxyServer() is first
  invoked at runtime (NOT at import time). A process.emitWarning override
  placed before the proxy instantiations intercepts only DEP0060 without
  suppressing any other warnings. No package version changes needed.

Also includes linter/formatter normalisation across multiple files.

backend/src/services/MonitorService.ts

@@ -121,7 +121,7 @@ export class MonitorService {
                 const nodes = DatabaseService.getInstance().getNodes();
                 for (const node of nodes) {
                     if (!node.id) continue;
-                    // Remote nodes run their own MonitorService locally — skip direct Docker access
+                    // Remote nodes run their own MonitorService locally - skip direct Docker access
                     if (node.type === 'remote') continue;
                     try {
                         const docker = DockerController.getInstance(node.id);
@@ -208,7 +208,7 @@ export class MonitorService {
 
         for (const node of nodes) {
             if (!node.id) continue;
-            // Remote nodes are self-monitoring — skip direct Docker access
+            // Remote nodes are self-monitoring - skip direct Docker access
             if (node.type === 'remote') continue;
             try {
                 const docker = DockerController.getInstance(node.id);
@@ -329,7 +329,7 @@ export class MonitorService {
 
     private calculateMemoryPercent(stats: any): number {
         if (!stats?.memory_stats?.usage || !stats?.memory_stats?.limit) return 0.0;
-        
+
         const used_memory = stats.memory_stats.usage - (stats.memory_stats.stats?.cache || 0);
         const available_memory = stats.memory_stats.limit;
         if (available_memory > 0) {