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>

backend-nest/src/modules/kits/kits.controller.ts

@@ -0,0 +1,80 @@
+import {
+  Controller,
+  Get,
+  Post,
+  Put,
+  Delete,
+  Body,
+  Param,
+  UseGuards,
+} from '@nestjs/common';
+import { ApiTags, ApiBearerAuth, ApiOperation } from '@nestjs/swagger';
+import { KitsService } from './kits.service';
+import { CreateKitsConfigDto } from './dto/create-kits-config.dto';
+import { UpdateKitsConfigDto } from './dto/update-kits-config.dto';
+import { ImportKitsConfigDto } from './dto/import-kits-config.dto';
+import { CurrentTenant } from '../../common/decorators/current-tenant.decorator';
+import { RequirePermission } from '../../common/decorators/require-permission.decorator';
+import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard';
+import { PermissionsGuard } from '../../common/guards/permissions.guard';
+
+@ApiTags('kits')
+@ApiBearerAuth()
+@Controller('kits')
+@UseGuards(JwtAuthGuard, PermissionsGuard)
+export class KitsController {
+  constructor(private readonly kitsService: KitsService) {}
+
+  @Get('configs')
+  @RequirePermission('kits.view')
+  @ApiOperation({ summary: 'List kits configs (summaries)' })
+  getConfigs(@CurrentTenant() licenseId: string) {
+    return this.kitsService.getConfigs(licenseId);
+  }
+
+  @Get('configs/:id')
+  @RequirePermission('kits.view')
+  @ApiOperation({ summary: 'Get full kits config with data' })
+  getConfig(@CurrentTenant() licenseId: string, @Param('id') id: string) {
+    return this.kitsService.getConfig(licenseId, id);
+  }
+
+  @Post('configs')
+  @RequirePermission('kits.manage')
+  @ApiOperation({ summary: 'Create kits config' })
+  createConfig(@CurrentTenant() licenseId: string, @Body() dto: CreateKitsConfigDto) {
+    return this.kitsService.createConfig(licenseId, dto);
+  }
+
+  @Put('configs/:id')
+  @RequirePermission('kits.manage')
+  @ApiOperation({ summary: 'Update kits config' })
+  updateConfig(
+    @CurrentTenant() licenseId: string,
+    @Param('id') id: string,
+    @Body() dto: UpdateKitsConfigDto,
+  ) {
+    return this.kitsService.updateConfig(licenseId, id, dto);
+  }
+
+  @Delete('configs/:id')
+  @RequirePermission('kits.manage')
+  @ApiOperation({ summary: 'Delete kits config' })
+  deleteConfig(@CurrentTenant() licenseId: string, @Param('id') id: string) {
+    return this.kitsService.deleteConfig(licenseId, id);
+  }
+
+  @Post('configs/:id/apply')
+  @RequirePermission('kits.manage')
+  @ApiOperation({ summary: 'Deploy kits config to server' })
+  applyToServer(@CurrentTenant() licenseId: string, @Param('id') id: string) {
+    return this.kitsService.applyToServer(licenseId, id);
+  }
+
+  @Post('import-from-server')
+  @RequirePermission('kits.manage')
+  @ApiOperation({ summary: 'Import Kits.json from server via NATS' })
+  importFromServer(@CurrentTenant() licenseId: string, @Body() dto: ImportKitsConfigDto) {
+    return this.kitsService.importFromServer(licenseId, dto.config_name, dto.description);
+  }
+}