feat: Add Kits + FurnaceSplitter plugin config modules

DB migrations 016 (kits_configs) and 019 (furnacesplitter_configs) applied.
Backend: NestJS modules with CRUD, apply-to-server, import-from-server.
Frontend: Pinia stores, Vue views with config editor, router + nav wiring.
Kits view: 3-tab editor (list/editor/settings), kit items with shortname/amount/skinId/container.
FurnaceSplitter view: per-furnace toggles, split count, fuel multiplier settings.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/router/index.ts

@@ -130,6 +130,26 @@ const panelRoutes: RouteRecordRaw[] = [
         name: 'autodoors',
         component: () => import('@/views/admin/AutoDoorsView.vue'),
       },
+      {
+        path: 'kits',
+        name: 'kits-config',
+        component: () => import('@/views/admin/KitsView.vue'),
+      },
+      {
+        path: 'furnace-splitter',
+        name: 'furnace-splitter',
+        component: () => import('@/views/admin/FurnaceSplitterView.vue'),
+      },
+      {
+        path: 'better-chat',
+        name: 'better-chat',
+        component: () => import('@/views/admin/BetterChatView.vue'),
+      },
+      {
+        path: 'timed-execute',
+        name: 'timed-execute',
+        component: () => import('@/views/admin/TimedExecuteView.vue'),
+      },
       {
         path: 'wipes',
         name: 'wipes',