feat(houses): tier house visibility — public IDOC-only, staff full, player own

Per request, split the single public house registry into three role-scoped views:

- Public /site/houses → only houses in DANGER (IDOC), by LOCATION (region + map/
  coords). No owner, price, co-owners or decay detail. Renamed "Houses in danger";
  kept live via the public house.decay feed. The full-registry deltas
  (house.update / house.remove — which carry owner/price) are REMOVED from the
  public SSE allowlist so they never reach the public channel.
- Staff full registry → new /admin/houses (admin + moderator, RoleGate + MOD_PATHS)
  backed by GET /admin/shard/houses (modAccess), with owner/price/co-owners/decay
  and search, kept live on the admin SSE channel.
- Player portal → "My houses" home-status section (own houses only, with decay/
  IDOC status) via GET /player/shard/houses, scoped to the caller's linked accounts.

Server tests green, client build clean, swagger regenerated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/src/routes/admin/AdminLayout.jsx

@@ -64,6 +64,7 @@ const NAV = [
     items: [
       { to: '/admin/moderation', label: 'Moderation', icon: IconShield, roles: ['admin', 'moderator'] },
       { to: '/admin/shard-ops', label: 'In-Game Ops', icon: IconShard, roles: ['admin', 'moderator'] },
+      { to: '/admin/houses', label: 'Houses', icon: IconShard, roles: ['admin', 'moderator'] },
     ],
   },
   {
@@ -97,6 +98,7 @@ const TITLES = {
   '/admin/hero': 'Hero Editor',
   '/admin/moderation': 'Moderation',
   '/admin/shard-ops': 'In-Game Ops',
+  '/admin/houses': 'House Registry',
   '/admin/settings': 'Site Settings',
   '/admin/activity': 'Activity Log',
   '/admin/bot-activity': 'Web Bot Activity',
@@ -143,7 +145,7 @@ export default function AdminLayout() {
   // Moderators only get the moderation section (Discord + in-game ops) + their
   // own account security.
   const isModerator = user?.role === 'moderator'
-  const MOD_PATHS = ['/admin/moderation', '/admin/shard-ops', '/admin/account']
+  const MOD_PATHS = ['/admin/moderation', '/admin/shard-ops', '/admin/houses', '/admin/account']
   const visible = (item) => {
     if (item.roles && !item.roles.includes(user?.role)) return false
     if (isModerator) return MOD_PATHS.includes(item.to)