refactor: 拆分核心玩法模块并优化代码质量

将 WechatGame 单体模块拆分为独立的 User、Level、GameConfig 模块，
新增体力值系统、关卡闯关流程，并修复多项代码质量问题：
- 体力不足错误码从 401 修正为 400
- enterLevel 改用 findById 替代全表扫描
- consumeStamina 增加原子更新防止并发竞态
- 并行化独立数据库查询 (Promise.all)
- 移除 WechatGameService/Controller 死代码

src/modules/game-config/game-config.controller.ts

@@ -0,0 +1,39 @@
+import { Controller, Get, Param } from '@nestjs/common';
+import { ApiOperation, ApiResponse, ApiTags } from '@nestjs/swagger';
+import { GameConfigService } from './game-config.service';
+import {
+  GameConfigResponseDto,
+  GameConfigListResponseDto,
+} from '../wechat-game/dto/game-config-response.dto';
+import { ApiResponseDto } from '../../common/dto/api-response.dto';
+
+@ApiTags('游戏配置')
+@Controller('v1/game-configs')
+export class GameConfigController {
+  constructor(private readonly gameConfigService: GameConfigService) {}
+
+  @Get()
+  @ApiOperation({
+    summary: '获取所有游戏配置',
+    description: '获取所有激活的游戏配置列表',
+  })
+  @ApiResponse({ status: 200, description: '成功获取配置列表' })
+  async getAllConfigs(): Promise<ApiResponseDto<GameConfigListResponseDto>> {
+    const data = await this.gameConfigService.getAllConfigs();
+    return ApiResponseDto.success(data);
+  }
+
+  @Get(':key')
+  @ApiOperation({
+    summary: '根据 key 获取配置',
+    description: '根据配置键名获取单个游戏配置',
+  })
+  @ApiResponse({ status: 200, description: '成功获取配置' })
+  @ApiResponse({ status: 404, description: '配置不存在' })
+  async getConfigByKey(
+    @Param('key') key: string,
+  ): Promise<ApiResponseDto<GameConfigResponseDto>> {
+    const data = await this.gameConfigService.getConfigByKey(key);
+    return ApiResponseDto.success(data);
+  }
+}

src/modules/game-config/game-config.module.ts

@@ -0,0 +1,11 @@
+import { Module } from '@nestjs/common';
+import { GameConfigController } from './game-config.controller';
+import { GameConfigService } from './game-config.service';
+import { WechatGameModule } from '../wechat-game/wechat-game.module';
+
+@Module({
+  imports: [WechatGameModule],
+  controllers: [GameConfigController],
+  providers: [GameConfigService],
+})
+export class GameConfigModule {}

src/modules/game-config/game-config.service.ts

@@ -0,0 +1,42 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { GameConfigRepository } from '../wechat-game/repositories/game-config.repository';
+import {
+  GameConfigResponseDto,
+  GameConfigListResponseDto,
+} from '../wechat-game/dto/game-config-response.dto';
+import { GameConfig } from '../wechat-game/entities/game-config.entity';
+
+@Injectable()
+export class GameConfigService {
+  constructor(
+    private readonly gameConfigRepository: GameConfigRepository,
+  ) {}
+
+  async getAllConfigs(): Promise<GameConfigListResponseDto> {
+    const configs = await this.gameConfigRepository.findActiveConfigs();
+    return {
+      configs: configs.map((config) => this.toResponseDto(config)),
+      total: configs.length,
+    };
+  }
+
+  async getConfigByKey(key: string): Promise<GameConfigResponseDto> {
+    const config = await this.gameConfigRepository.findByKey(key);
+    if (!config) {
+      throw new NotFoundException(`Game config with key "${key}" not found`);
+    }
+    return this.toResponseDto(config);
+  }
+
+  private toResponseDto(config: GameConfig): GameConfigResponseDto {
+    return {
+      id: config.id,
+      configKey: config.configKey,
+      configValue: config.configValue,
+      description: config.description,
+      isActive: config.isActive,
+      createdAt: config.createdAt,
+      updatedAt: config.updatedAt,
+    };
+  }
+}