Show per-PC credentials across the admin interface

- Endpoints (shared key) page: the key is presented as what PCs use until
  they enroll, with enrollment progress, a link to Enrollment, rewritten
  guidance, and rotate/revoke confirmations that say how many PCs are not
  enrolled yet.
- Settings cards describe the server certificate as what PCs actually
  receive, on IIS or Docker; Enrollment has its own icon (the icon set lacked
  the one the Server Certificate card already asked for).
- Server Certificate page checks the certificate the site presents at its
  public address and compares its pin with the certificate file, warning when
  they differ. The host comes from site settings only; the check is a TLS
  handshake, never an HTTP request.
- Fleet list: Credential column and filter (enrolled, pending, re-enroll
  blocked, shared key, not reporting), computed in the list query.
- PC detail: credential state, prefix and dates for fleet readers, state only
  for others, with admin Revoke (optionally blocking re-enrollment) and Allow
  re-enrollment.
- Dashboard: pending enrollment requests, and PCs blocked from re-enrolling
  for more than seven days.
- Runbook: where to find each of these in the app.

frontend/src/api/index.js

@@ -240,6 +240,19 @@ export const endpointsApi = {
     }
     return api.post(`/endpoints/${assetId}/agentupgrade`, body)
   },
+  // Per-PC credential administration (admin role, re-checked server-side).
+  // blockreenroll keeps the PC from enrolling again until allowReenroll.
+  revokeCredential(assetId, opts = {}) {
+    const body = {}
+    if (opts.blockreenroll) {
+      body.blockreenroll = true
+      if (opts.reason) body.reason = opts.reason
+    }
+    return api.post(`/endpoints/enrollment/assets/${assetId}/revoke`, body)
+  },
+  allowReenroll(assetId) {
+    return api.post(`/endpoints/enrollment/assets/${assetId}/allow-reenroll`)
+  },
   listCommands(assetId) {
     return api.get(`/endpoints/${assetId}/commands`)
   },

frontend/src/composables/settingsCatalog.js

@@ -4,7 +4,7 @@
 // (landing) read the merged catalog so plugins add settings cards with no core
 // edit. Fetched once into a module-level ref and shared across callers.
 import { ref, computed } from 'vue'
-import { Ruler, Wrench, Cog, Package, Settings, Puzzle, SlidersHorizontal, Palette, Bell, Network, Printer, Droplets, Terminal, KeyRound } from 'lucide-vue-next'
+import { Ruler, Wrench, Cog, Package, Settings, Puzzle, SlidersHorizontal, Palette, Bell, Network, Printer, Droplets, Terminal, KeyRound, ShieldCheck, BadgeCheck } from 'lucide-vue-next'
 import api from '../api'
 import router from '../router'
 import { settingsGroups } from '../views/settings/settingsNav'
@@ -28,6 +28,9 @@ const iconMap = {
   // The endpoints agent-key card has asked for 'key' since it shipped and has
   // been silently drawing a puzzle piece the whole time.
   key: KeyRound,
+  // Server Certificate asked for 'shield-check' and drew the puzzle fallback.
+  'shield-check': ShieldCheck,
+  'badge-check': BadgeCheck,
 }
 
 function resolveIcon(key) {