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/ComposeService.ts

@@ -6,7 +6,7 @@ import { LogFormatter } from './LogFormatter';
 import { NodeRegistry } from './NodeRegistry';
 
 /**
- * ComposeService — local docker compose CLI execution.
+ * ComposeService - local docker compose CLI execution.
  *
  * In the Distributed API model, remote node compose operations are handled
  * by the remote Sencho instance. This service only executes commands locally.
@@ -160,7 +160,7 @@ export class ComposeService {
         let localProcesses: ReturnType<typeof spawn>[] = [];
 
         const onWsClose = () => {
-          localProcesses.forEach(cp => { try { cp.kill(); } catch {} });
+          localProcesses.forEach(cp => { try { cp.kill(); } catch { } });
         };
 
         ws.on('close', onWsClose);