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.

frontend/src/components/BashExecModal.tsx

@@ -75,7 +75,7 @@ export default function BashExecModal({ isOpen, onClose, containerId, containerN
         return;
       }
 
-      // Node exists and has layout — safe to initialize xterm!
+      // Node exists and has layout - safe to initialize xterm!
       initTerminal(container);
     };
 
@@ -160,7 +160,7 @@ export default function BashExecModal({ isOpen, onClose, containerId, containerN
         setIsConnected(false);
       };
 
-      // Handle user input — JSON up
+      // Handle user input - JSON up
       term.onData((data) => {
         if (ws.readyState === WebSocket.OPEN) {
           ws.send(JSON.stringify({
@@ -224,9 +224,9 @@ export default function BashExecModal({ isOpen, onClose, containerId, containerN
             Interactive bash terminal session for {containerName}
           </DialogDescription>
         </DialogHeader>
-        {/* Styling wrapper — padding and rounded corners go here */}
+        {/* Styling wrapper - padding and rounded corners go here */}
         <div className="flex-1 rounded-lg bg-[#1e1e1e] p-1 min-h-0" style={{ overflow: 'hidden' }}>
-          {/* Clean xterm container — NO padding, NO overflow-hidden, explicit dimensions */}
+          {/* Clean xterm container - NO padding, NO overflow-hidden, explicit dimensions */}
           <div
             ref={terminalRef}
             style={{ width: '100%', height: '100%' }}