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/unifi/templates/unifi/inventory.html

@@ -61,7 +61,7 @@
       {% if rule.ruleset != ns.current_rs %}
       {% set ns.current_rs = rule.ruleset %}
       <tr>
-        <td colspan="3" style="padding:0.4rem 0 0.2rem;color:var(--text-muted);font-size:0.75rem;font-weight:600;letter-spacing:0.04em;text-transform:uppercase;">
+        <td colspan="3" style="padding:0.4rem 0 0.2rem;color:var(--text-muted);font-size:0.75rem;font-weight:500;letter-spacing:0.04em;text-transform:uppercase;">
           {{ rule.ruleset }}
         </td>
       </tr>
@@ -73,12 +73,7 @@
           </span>
         </td>
         <td style="padding:0.2rem 0.3rem;white-space:nowrap;">
-          <span style="font-size:0.75rem;padding:0.1rem 0.35rem;border-radius:3px;background:
-            {% if rule.action == 'accept' %}rgba(64,160,64,0.2)
-            {% elif rule.action == 'drop' %}rgba(192,64,64,0.2)
-            {% else %}rgba(192,128,64,0.2){% endif %};">
-            {{ rule.action }}
-          </span>
+          <span class="badge badge-{{ {'accept': 'ok', 'drop': 'crit'}.get(rule.action, 'warn') }}">{{ rule.action }}</span>
         </td>
         <td style="padding:0.2rem 0;color:var(--text-dim);font-size:0.76rem;">
           {% if rule.protocol %}{{ rule.protocol }}{% endif %}