feat(admin): view a user's shard footprint at /admin/users/:id

Add a "View" action beside Edit in the users table that opens a dedicated,
read-only page showing everything the uo-link shard knows about a user,
scoped to their linked game accounts: character rosters, currently-online
characters, houses (IDOC-first), and recent vendor sales.

Backend (admin-only, under the existing /users adminOnly gate):
- GET /admin/users/:id — single sanitized user (page is deep-linkable)
- GET /admin/users/:id/shard/{accounts,sales,houses,online}
- shardState: listHousesByAccounts / listOnlineByAccounts (+ model shapers)
- Extract salesForAccounts into utils/shardSales; reuse in player getSales
- Live rosters reuse the existing admin-bypass /admin/shard/* endpoints,
  so no new routes for roster/vendors/char

Frontend:
- UserDetail page reusing CharacterStats / GameAccounts / VendorSales
- GameAccounts gains a readOnly prop (drops link form + self-voice copy)
- api.admin.getUser + api.admin.userShard(id) scope; route + layout title

Tests: adminUserShard.test.js (404, account scoping, empty accounts,
salesForAccounts cap/filter). Full server suite 164 pass; client builds.

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

server/src/router/v1/player/shard.controller.js

@@ -9,7 +9,7 @@
 
 const uoLinkClient = require('../../../utils/uoLinkClient')
 const shardLinks = require('../../../model/shardLinks/shardLinks.model')
-const shardEvents = require('../../../model/shardEvents/shardEvents.model')
+const { salesForAccounts } = require('../../../utils/shardSales')
 const activity = require('../../../model/activity/activity.model')
 
 const log = require('../../../utils/logger')('player-shard')
@@ -120,21 +120,8 @@ async function getChar(req, res) {
 async function getSales(req, res) {
   try {
     const links = await shardLinks.listForUser(req.user.id)
-    const accounts = new Set(links.map((l) => l.account))
-    if (accounts.size === 0) return res.json([])
-    const events = await shardEvents.list({ kind: 'vendor.sale', limit: 500 })
-    const mine = events
-      .filter((e) => e.payload && accounts.has(e.payload.ownerAcct))
-      .slice(0, 50)
-      .map((e) => ({
-        t: e.t,
-        itemType: e.payload.itemType,
-        amount: e.payload.amount,
-        price: e.payload.price,
-        commission: e.payload.commission,
-        ownerAcct: e.payload.ownerAcct,
-      }))
-    return res.json(mine)
+    const accounts = links.map((l) => l.account)
+    return res.json(await salesForAccounts(accounts))
   } catch (err) {
     log.error('player.shard.getSales', err)
     return res.status(500).json({ message: 'Internal Server Error' })