Add admin shard control: config, status, town crier (phase 5)

- admin/uoLink.controller.js: GET /admin/uo-link/config (masked config + live
  health + ingestion stats from the socket/broadcaster); PUT to save base/ws
  URL + write-only token + protocol + enabled, which (re)starts or stops the WS
  ingest client and activity-logs the change; POST/DELETE /uo-link/towncrier to
  publish/remove town-crier messages; GET /uo-link/stream (admin SSE channel,
  full feed incl. audit/cheat). Mounted adminOnly with express-validator guards
  + #swagger annotations (new "Admin · Shard" tag, TownCrierRequest schema).
- server.js: startup probe (checkUoLink) that logs reachability and warns
  loudly on a protocol mismatch when the integration is enabled.
- client: api.admin uo-link methods; ShardAdmin.jsx control panel (status
  panel with ingestion stats, config form, town crier) modeled on
  DiscordBotAdmin; wired into AdminLayout nav/titles + the /admin/shard route.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011qPmpmVH1xGCiZoz9m9vW3

client/src/api/client.js

@@ -223,6 +223,12 @@ export const api = {
     getDiscordBotConfig: () => req('/admin/discord-bot/config'),
     saveDiscordBotConfig: (data) => req('/admin/discord-bot/config', { method: 'PUT', body: data }),
 
+    // ----- uo-link sidecar control (admin only) -----
+    getUoLinkConfig: () => req('/admin/uo-link/config'),
+    saveUoLinkConfig: (data) => req('/admin/uo-link/config', { method: 'PUT', body: data }),
+    postTownCrier: (data) => req('/admin/uo-link/towncrier', { method: 'POST', body: data }),
+    deleteTownCrier: (id) => req(`/admin/uo-link/towncrier/${encodeURIComponent(id)}`, { method: 'DELETE' }),
+
     // ----- Email delivery / Gmail OAuth2 (admin only) -----
     getEmailConfig: () => req('/admin/email/config'),
     saveEmailConfig: (data) => req('/admin/email/config', { method: 'PUT', body: data }),