feat: Complete NestJS backend scaffold — 22 modules, 39 entities, WebSocket gateway

Full backend rewrite from Rust/Axum to NestJS/TypeScript.
- 22 feature modules (auth, servers, wipes, maps, plugins, players, console,
  chat, team, notifications, settings, schedules, analytics, alerts, status,
  store, webstore, admin, setup, migration, users, licenses)
- 39 TypeORM entities matching PostgreSQL schema (12 migrations)
- Common infrastructure: JWT/RBAC guards, decorators, exception filter
- NATS service with pub/sub/request-reply
- Socket.IO WebSocket gateway with NATS bridge
- Docker: NestJS Dockerfile + updated docker-compose.yml
- Zero compile errors (npx tsc --noEmit clean)

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

backend-nest/src/modules/alerts/dto/update-alert-config.dto.ts

@@ -0,0 +1,42 @@
+import { IsBoolean, IsInt, IsOptional, Min, Max } from 'class-validator';
+import { ApiPropertyOptional } from '@nestjs/swagger';
+
+export class UpdateAlertConfigDto {
+  @ApiPropertyOptional({ description: 'Enable population drop alerts' })
+  @IsOptional()
+  @IsBoolean()
+  population_drop_enabled?: boolean;
+
+  @ApiPropertyOptional({ description: 'Population drop threshold percentage' })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  @Max(100)
+  population_drop_threshold_percent?: number;
+
+  @ApiPropertyOptional({ description: 'Enable FPS degradation alerts' })
+  @IsOptional()
+  @IsBoolean()
+  fps_degradation_enabled?: boolean;
+
+  @ApiPropertyOptional({ description: 'FPS threshold for alerts' })
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  fps_threshold?: number;
+
+  @ApiPropertyOptional({ description: 'Send alerts to Discord' })
+  @IsOptional()
+  @IsBoolean()
+  notify_discord?: boolean;
+
+  @ApiPropertyOptional({ description: 'Send alerts to Pushbullet' })
+  @IsOptional()
+  @IsBoolean()
+  notify_pushbullet?: boolean;
+
+  @ApiPropertyOptional({ description: 'Send alerts via email' })
+  @IsOptional()
+  @IsBoolean()
+  notify_email?: boolean;
+}