fix: add admin-ai-chat module + fix AdminUsersModule PasswordService dependency

src/app.module.ts

@@ -1,4 +1,4 @@
-import { Module } from '@nestjs/common';
+import { Module } from '@nestjs/common';
 import { ConfigModule, ConfigService } from '@nestjs/config';
 import { APP_FILTER, APP_GUARD, APP_INTERCEPTOR, APP_PIPE } from '@nestjs/core';
 import { JwtModule } from '@nestjs/jwt';
@@ -15,6 +15,7 @@ import { AuthModule } from './modules/auth/auth.module';
 import { AdminAuthModule } from './modules/admin-auth/admin-auth.module';
 import { AdminDashboardModule } from './modules/admin-dashboard/admin-dashboard.module';
 import { AdminUsersModule } from './modules/admin-users/admin-users.module';
+import { AdminAiChatModule } from './modules/admin-ai-chat/admin-ai-chat.module';
 import { AdminAuditLogModule } from './modules/admin-audit-log/admin-audit-log.module';
 import { UsersModule } from './modules/users/users.module';
 import { KnowledgeBaseModule } from './modules/knowledge-base/knowledge-base.module';
@@ -87,6 +88,7 @@ import appleConfig from './config/apple.config';
     AdminAuthModule,
     AdminDashboardModule,
     AdminUsersModule,
+    AdminAiChatModule,
     AdminAuditLogModule,
     UsersModule,
     KnowledgeBaseModule,

src/modules/admin-ai-chat/admin-ai-chat.controller.ts

@@ -0,0 +1,23 @@
+import { ApiTags, ApiOperation, ApiBearerAuth } from '@nestjs/swagger';
+import { Controller, Post, Body, UseGuards } from '@nestjs/common';
+import { AdminAiChatService } from './admin-ai-chat.service';
+import { AiChatDto } from './dto/ai-chat.dto';
+import { AdminAuthGuard } from '../../common/guards/admin-auth.guard';
+import { AdminRolesGuard } from '../../common/guards/admin-roles.guard';
+import { AdminRoles } from '../../common/decorators/admin-roles.decorator';
+import type { AdminRole } from '../../common/types/role.enum';
+
+@ApiTags('admin-ai-chat')
+@Controller('admin-api/ai')
+@UseGuards(AdminAuthGuard, AdminRolesGuard)
+export class AdminAiChatController {
+  constructor(private readonly aiChatService: AdminAiChatService) {}
+
+  @Post('chat')
+  @AdminRoles('SUPER_ADMIN' as AdminRole)
+  @ApiBearerAuth()
+  @ApiOperation({ summary: 'AI 对话（仅超级管理员）' })
+  async chat(@Body() dto: AiChatDto) {
+    return this.aiChatService.chat(dto);
+  }
+}

src/modules/admin-ai-chat/admin-ai-chat.module.ts

@@ -0,0 +1,12 @@
+import { Module } from '@nestjs/common';
+import { AdminAiChatController } from './admin-ai-chat.controller';
+import { AdminAiChatService } from './admin-ai-chat.service';
+import { DeepSeekProvider } from '../ai/providers/deepseek.provider';
+import { AdminAuthGuard } from '../../common/guards/admin-auth.guard';
+import { AdminRolesGuard } from '../../common/guards/admin-roles.guard';
+
+@Module({
+  controllers: [AdminAiChatController],
+  providers: [AdminAiChatService, DeepSeekProvider, AdminAuthGuard, AdminRolesGuard],
+})
+export class AdminAiChatModule {}

src/modules/admin-ai-chat/admin-ai-chat.service.ts

@@ -0,0 +1,37 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { DeepSeekProvider } from '../ai/providers/deepseek.provider';
+import type { AiChatDto } from './dto/ai-chat.dto';
+
+@Injectable()
+export class AdminAiChatService {
+  private readonly logger = new Logger(AdminAiChatService.name);
+
+  constructor(private readonly deepseek: DeepSeekProvider) {}
+
+  async chat(dto: AiChatDto) {
+    const systemMessages = dto.messages.filter(m => m.role === 'system');
+    const hasSystemPrompt = systemMessages.length > 0;
+
+    const messages = hasSystemPrompt
+      ? dto.messages
+      : [
+          { role: 'system' as const, content: '你是知习管理后台的 AI 任务助理，帮助管理员处理日常任务、解答问题。请用简洁专业的中文回复。' },
+          ...dto.messages,
+        ];
+
+    const start = Date.now();
+    const result = await this.deepseek.generate({
+      model: 'deepseek-chat',
+      messages,
+      temperature: 0.7,
+      maxTokens: 4096,
+    });
+
+    this.logger.log(`AI chat completed in ${Date.now() - start}ms, tokens: ${result.usage?.inputTokens ?? 0}/${result.usage?.outputTokens ?? 0}`);
+
+    return {
+      content: result.rawText,
+      usage: result.usage,
+    };
+  }
+}

src/modules/admin-ai-chat/dto/ai-chat.dto.ts

@@ -0,0 +1,27 @@
+import { IsString, IsArray, ValidateNested, IsOptional, IsIn, MinLength } from 'class-validator';
+import { Type } from 'class-transformer';
+import { ApiProperty } from '@nestjs/swagger';
+
+export class ChatMessageDto {
+  @ApiProperty({ enum: ['user', 'assistant', 'system'] })
+  @IsString()
+  @IsIn(['user', 'assistant', 'system'])
+  role: 'user' | 'assistant' | 'system';
+
+  @ApiProperty()
+  @IsString()
+  @MinLength(1)
+  content: string;
+}
+
+export class AiChatDto {
+  @ApiProperty({ type: [ChatMessageDto] })
+  @IsArray()
+  @ValidateNested({ each: true })
+  @Type(() => ChatMessageDto)
+  messages: ChatMessageDto[];
+
+  @ApiProperty({ required: false, default: false })
+  @IsOptional()
+  stream?: boolean;
+}

src/modules/admin-users/admin-users.module.ts

@@ -2,10 +2,11 @@ import { Module } from '@nestjs/common';
 import { AdminUsersController } from './admin-users.controller';
 import { AdminUsersService } from './admin-users.service';
 import { AdminAuthModule } from '../admin-auth/admin-auth.module';
+import { PasswordService } from '../../common/utils/password.service';
 
 @Module({
   imports: [AdminAuthModule],
   controllers: [AdminUsersController],
-  providers: [AdminUsersService],
+  providers: [AdminUsersService, PasswordService],
 })
 export class AdminUsersModule {}