feat(shard): admin write plane, help-page queue, and public champion board

Wire up the three uo-link sidecar surfaces that weren't integrated yet.

Champion spawns
- Ingest champ.update/champ.remove into a new shard_champs table (served from
  our own store, like online/houses); public /site/champs board with a nav link,
  live via the existing SSE feed (champ.* added to the public allowlist).

Staff write plane (admin + moderator)
- kick / ban / unban / broadcast via /admin/shard/*; actor is stamped server-side
  from the session, never the browser. Sidecar status codes mapped (403 disabled/
  protected, 404 unknown, 503/504 transient). admin.audit events are logged and
  surfaced at /admin/shard/audit.
- New admin "In-Game Ops" view (/admin/shard-ops), plus per-account Kick/Ban/Unban
  on the user-detail and character views (ShardAccountActions, self-gated to staff).

Help-page (support) queue
- Ingest page.new/updated/closed into a new shard_pages table; respond/close via
  /admin/shard/pages/*. Champ board and page queue are snapshotted from the
  sidecar's /champs and /pages on every WS (re)connect (guarded so a failed call
  never wipes local state).

Verified live end-to-end against MariaDB + the Rust sidecar + ServUO; unit tests
cover ingest routing (shardIngest.champsPages.test.js). Swagger regenerated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0114TpmrNW4wNXsHq5CR72jQ

server/src/utils/uoLinkSocket.js

@@ -16,6 +16,7 @@ const WebSocket = require('ws')
 const uoLinkConfig = require('../model/uoLinkConfig/uoLinkConfig.model')
 const uoLinkClient = require('./uoLinkClient')
 const shardIngest = require('./shardIngest')
+const shardState = require('../model/shardState/shardState.model')
 const log = require('./logger')('uo-link-socket')
 
 const BACKOFF_MIN_MS = 1000
@@ -59,6 +60,21 @@ async function backfill() {
       const series = [...eco.data.series].reverse()
       for (const ev of series) await shardIngest.ingest(ev, { fromBackfill: true })
     }
+
+    // Champ board + help-page queue have no replay stream — snapshot the
+    // authoritative current state directly (the sidecar guide's advice for both),
+    // reconciling our tables to it so a stale row from before a disconnect can't
+    // linger. Live champ.*/page.* deltas keep them fresh thereafter.
+    const champs = await uoLinkClient.getChamps()
+    if (champs.ok && champs.data && Array.isArray(champs.data.spawns)) {
+      await shardState.replaceChamps(champs.data.spawns)
+      log.info('snapshotted champ board from /champs', { count: champs.data.spawns.length })
+    }
+    const pages = await uoLinkClient.getPages()
+    if (pages.ok && pages.data && Array.isArray(pages.data.pages)) {
+      await shardState.replacePages(pages.data.pages)
+      log.info('snapshotted help-page queue from /pages', { count: pages.data.pages.length })
+    }
   } catch (err) {
     log.warn('backfill failed (continuing on live feed)', { message: err.message })
   }