feat: add system metrics dashboard with resource monitoring

- Add system metrics endpoint (CPU load, memory, swap, network traffic)
- Collect metrics from /proc and /sys (no subprocess required)
- Overhaul dashboard to pull from per-subsystem models
- Remove deprecated /status/all monolithic endpoint
- Improve networkd import to handle optional priority prefix
- Fix CSS duplicate .grid-4 rule and unused dashboard imports

webui/server.py

@@ -17,8 +17,6 @@ from pathlib import Path
 from flask import Flask, abort, request
 from werkzeug.middleware.proxy_fix import ProxyFix
 
-from daemon.client import get
-from daemon.iface import GET_STATUS_ALL
 from lib.logging import setup_logging
 from webui.api.certs import bp as certs_bp
 from webui.api.dhcp import bp as dhcp_bp
@@ -158,27 +156,6 @@ def _log_request_finish(response):
     return response
 
 
-# ---------------------------------------------------------------------------
-# API proxy routes
-# ---------------------------------------------------------------------------
-
-
-@app.route("/api/status/all")
-def api_status_all():
-    """Return aggregated status from all subsystems.
-
-    Proxies the daemon's ``/status/all`` endpoint for SPA consumption.
-
-    Returns:
-        JSON response with state data for all subsystems.
-    """
-    try:
-        return {"ok": True, "data": get(GET_STATUS_ALL)}
-    except Exception as exc:
-        logger.warning("Status all failed: %s", exc)
-        return {"ok": False, "error": str(exc)}, 500
-
-
 # ---------------------------------------------------------------------------
 # SPA entry point — serve index.html for /, 404 for everything else
 # ---------------------------------------------------------------------------