feat: Add RaidableBases plugin config module — DB migration, NestJS CRUD, Vue editor

- Migration 021: raidablebases_configs table with JSONB config_data
- Entity, module, controller (7 endpoints), service with NATS deploy/import
- Frontend: 4-tab editor (General, Difficulty, NPC, Loot & Rewards)
- Pinia store, types, router route, sidebar nav with Swords icon
- Top 30 most common settings with actual RaidableBases.json key paths
- Difficulty sub-tabs for Easy/Medium/Hard/Expert/Nightmare with spawn day toggles

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

frontend/src/components/layout/DashboardLayout.vue

@@ -33,6 +33,7 @@ import {
   DoorOpen,
   Gift,
   Flame,
+  Swords,
   Menu,
   X,
 } from 'lucide-vue-next'
@@ -58,6 +59,7 @@ const navItems = [
   { name: 'Furnace Splitter', path: '/furnace-splitter', icon: Flame, permission: 'furnacesplitter.view' },
   { name: 'Better Chat', path: '/better-chat', icon: MessageSquare, permission: 'betterchat.view' },
   { name: 'Timed Execute', path: '/timed-execute', icon: Clock, permission: 'timedexecute.view' },
+  { name: 'Raidable Bases', path: '/raidable-bases', icon: Swords, permission: 'raidablebases.view' },
   { name: 'Auto-Wiper', path: '/wipes', icon: RefreshCw, permission: 'wipes.view' },
   { name: 'Maps', path: '/maps', icon: Map, permission: 'maps.view' },
   { name: 'Chat Log', path: '/chat', icon: MessageSquare, permission: 'chat.view' },