Feature: Plugin system, site search, notifications, webhooks, caching & loading states

- Plugin/module system with registry, hooks for admin nav/permissions/i18n
- Example Games plugin demonstrating the plugin system
- Site-wide search with Cmd+K command palette (cmdk-based)
- Real-time notification system (SSE + Redis pub/sub)
- Extensible webhook system with admin management UI
- Caching strategy: tiered data cache (unstable_cache + Redis)
- Theme import/export as JSON
- Loading states (spinner/skeleton) for all public pages
- Mobile responsive fixes (admin dashboard, guilds page)
- Webhooks admin page under Settings hub

src/plugins/games/messages/en.json

@@ -0,0 +1,29 @@
+{
+  "pages": {
+    "admin": {
+      "nav": {
+        "gamesGroup": "Games",
+        "navGames": "Games"
+      },
+      "hubs": {
+        "games": "Games",
+        "gamesSubtitle": "Manage in-game mini-games",
+        "tabs": {
+          "gamesOverview": "Overview",
+          "gameRooms": "Rooms",
+          "gameRanks": "Ranks",
+          "gameRewards": "Level Rewards",
+          "dailyChallenges": "Challenges"
+        }
+      },
+      "games": {
+        "title": "Games",
+        "subtitle": "Manage in-game mini-games",
+        "totalScores": "Total Scores",
+        "activeRooms": "Active Rooms",
+        "ranks": "Ranks",
+        "dailyChallenges": "Daily Challenges"
+      }
+    }
+  }
+}