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/chat/chat.service.ts

@@ -0,0 +1,51 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { ChatLog } from '../../entities/chat-log.entity';
+import { FlagMessageDto } from './dto/flag-message.dto';
+
+@Injectable()
+export class ChatService {
+  constructor(
+    @InjectRepository(ChatLog)
+    private readonly chatRepo: Repository<ChatLog>,
+  ) {}
+
+  /**
+   * Get recent chat messages for a license
+   */
+  async getMessages(licenseId: string, limit: number = 100) {
+    const messages = await this.chatRepo.find({
+      where: { license_id: licenseId },
+      order: { created_at: 'DESC' },
+      take: limit,
+    });
+
+    // Return in chronological order (oldest first for display)
+    return { messages: messages.reverse() };
+  }
+
+  /**
+   * Flag or unflag a chat message
+   */
+  async flagMessage(
+    licenseId: string,
+    messageId: string,
+    userId: string,
+    dto: FlagMessageDto,
+  ) {
+    const message = await this.chatRepo.findOne({
+      where: { id: messageId, license_id: licenseId },
+    });
+
+    if (!message) {
+      throw new NotFoundException('Message not found');
+    }
+
+    message.flagged = dto.flagged;
+    message.flagged_by = dto.flagged ? userId : null;
+    message.flag_reason = dto.flagged ? (dto.flag_reason || null) : null;
+
+    return await this.chatRepo.save(message);
+  }
+}