feat: Add GatherManager + AutoDoors plugin config modules

- GatherManager: 2-tab editor (Resource Rates with 1x-10x presets,
  Advanced with Pickup/Quarry/Excavator/Survey modifiers), 9 resource
  types with slider+number inputs, CRUD + deploy + import via NATS
- AutoDoors: Global settings (delay sliders, 6 toggles), 7 door type
  toggles, permission group overrides table, CRUD + deploy + import
- DB: migrations 015 (gather_configs) + 018 (autodoors_configs)
- Backend: GatherModule + AutoDoorsModule registered in app.module.ts
- Frontend: Pinia stores, Vue views, router routes, sidebar nav items
- Icons: Pickaxe (gather), DoorOpen (autodoors)
- All type checks pass: tsc + vue-tsc zero errors

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

backend-nest/src/app.module.ts

@@ -37,6 +37,10 @@ import { ChangelogModule } from './modules/changelog/changelog.module';
 import { FilesModule } from './modules/files/files.module';
 import { LootModule } from './modules/loot/loot.module';
 import { TeleportModule } from './modules/teleport/teleport.module';
+import { GatherModule } from './modules/gather/gather.module';
+import { AutoDoorsModule } from './modules/autodoors/autodoors.module';
+import { KitsModule } from './modules/kits/kits.module';
+import { FurnaceSplitterModule } from './modules/furnacesplitter/furnacesplitter.module';
 
 // Shared Services
 import { NatsService } from './services/nats.service';
@@ -109,6 +113,10 @@ import { NatsBridgeGateway } from './gateways/nats-bridge.gateway';
     FilesModule,
     LootModule,
     TeleportModule,
+    GatherModule,
+    AutoDoorsModule,
+    KitsModule,
+    FurnaceSplitterModule,
   ],
   providers: [
     // Global guards (order matters: auth first, then license, then permissions)