Initial commit: Telegram Management System

Full-stack web application for Telegram management
- Frontend: Vue 3 + Vben Admin
- Backend: NestJS
- Features: User management, group broadcast, statistics

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

backend-nestjs/src/modules/auth/strategies/local.strategy.ts

@@ -0,0 +1,24 @@
+import { Injectable, UnauthorizedException } from '@nestjs/common';
+import { PassportStrategy } from '@nestjs/passport';
+import { Strategy } from 'passport-local';
+
+import { AuthService } from '../auth.service';
+import { Admin } from '@database/entities/admin.entity';
+
+@Injectable()
+export class LocalStrategy extends PassportStrategy(Strategy) {
+  constructor(private readonly authService: AuthService) {
+    super({
+      usernameField: 'account',
+      passwordField: 'password',
+    });
+  }
+
+  async validate(account: string, password: string): Promise<Admin> {
+    const admin = await this.authService.validateUser(account, password);
+    if (!admin) {
+      throw new UnauthorizedException('账号或密码错误');
+    }
+    return admin;
+  }
+}