feat(plugins): Traefik problems first, UniFi/SNMP/fleet on shared shapes, audit names its entities, templates on tokens (#5126)

Traefik: routers are graded from their latest scrape (router_state: crit on
any real 5xx share, warn on p95 past the latency critical cutoff or a high
4xx share). Failing and slow routers lead as cards that say why; healthy
ones fold into one table that stays open or shut across polls. Proxy
counts are stat tiles; certificates are graded by Settings -> Thresholds
(tls_days).

UniFi: WAN health is a stat strip (latency graded by the thresholds),
devices carry status dots, event categories and firewall actions are
badges, the alarm count reuses .count-badge (renamed from .nav-count).
SNMP: each device wears a status badge and its readings are stat tiles.

Agent fleet: the table comes first, with a Status column (Reporting /
Silent / Never reported, by the host page's stale_after_seconds), silent
agents first, hosts linked, last seen as |ago.

Audit: entries name their entity (one query per type, steward/audit/
service.py) and link it; something deleted since keeps the name its entry
recorded and says "(deleted)".

Tokens: charts read colours through chart-colors.js (stewardColor resolves
a token to the rgb the browser computed; Chart.js defaults take the page's
text and border colours), so host, history, Traefik and SNMP charts drop
their hex. Template hex colours reach 0 (HEX_CEILING = 0), the last rgba
pills go, and heavy weights (600/700/bold, 60 of them) become 500, the
house pair being 400/500; a guard keeps templates there.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/host_agent/templates/host_detail.html

@@ -54,30 +54,30 @@
     interaction: { mode: "index", intersect: false },
     elements: { point: { radius: 0 } },
     scales: {
-      x: { type: "linear", ticks: { callback: (v) => fmtTime(v), maxTicksLimit: 8, color: "#8a8a92", font: { size: 10 } }, grid: { color: "#30303a" } },
-      y: { beginAtZero: true, max: ymax, ticks: { color: "#8a8a92", font: { size: 10 } }, grid: { color: "#30303a" } },
+      x: { type: "linear", ticks: { callback: (v) => fmtTime(v), maxTicksLimit: 8, font: { size: 10 } } },
+      y: { beginAtZero: true, max: ymax, ticks: { font: { size: 10 } } },
     },
     plugins: {
-      legend: { labels: { color: "#b8b8b0", boxWidth: 10, font: { size: 11 } } },
+      legend: { labels: { boxWidth: 10, font: { size: 11 } } },
       tooltip: { callbacks: { title: (items) => items.length ? fmtTime(items[0].parsed.x) : "" } },
     },
   });
   const defs = {
     "chart-util": { ymax: 100, ds: [
-      { key: "cpu_pct", label: "CPU %", color: "#c8a840" },
-      { key: "mem_used_pct", label: "Mem %", color: "#4aa86a" },
-      { key: "disk_used_pct_worst", label: "Disk % (worst)", color: "#c87840" },
+      { key: "cpu_pct", label: "CPU %", color: stewardColor("--gold") },
+      { key: "mem_used_pct", label: "Mem %", color: stewardColor("--green") },
+      { key: "disk_used_pct_worst", label: "Disk % (worst)", color: stewardColor("--yellow") },
     ] },
     "chart-net": { ymax: undefined, ds: [
-      { key: "net_rx_bps", label: "Net RX", color: "#4aa86a" },
-      { key: "net_tx_bps", label: "Net TX", color: "#c84048" },
-      { key: "disk_read_bps", label: "Disk read", color: "#6aa0d0" },
-      { key: "disk_write_bps", label: "Disk write", color: "#c8a840" },
+      { key: "net_rx_bps", label: "Net RX", color: stewardColor("--green") },
+      { key: "net_tx_bps", label: "Net TX", color: stewardColor("--red") },
+      { key: "disk_read_bps", label: "Disk read", color: stewardColor("--blue") },
+      { key: "disk_write_bps", label: "Disk write", color: stewardColor("--gold") },
     ] },
     "chart-pressure": { ymax: undefined, ds: [
-      { key: "load_1m", label: "Load 1m", color: "#c8a840" },
-      { key: "psi_mem_some_avg10", label: "Mem PSI %", color: "#c84048" },
-      { key: "temp_c_max", label: "Temp °C", color: "#c87840" },
+      { key: "load_1m", label: "Load 1m", color: stewardColor("--gold") },
+      { key: "psi_mem_some_avg10", label: "Mem PSI %", color: stewardColor("--red") },
+      { key: "temp_c_max", label: "Temp °C", color: stewardColor("--yellow") },
     ] },
   };
   const charts = {};