feat: 初始化项目结构并添加核心功能模块

- 新增文档模板和导航结构
- 实现服务器基础API路由和控制器
- 添加扩展插件配置和前端框架
- 引入多租户和权限管理模块
- 集成日志和数据库配置
- 添加核心业务模型和类型定义

server/src/services/SocialTrendSourcingService.ts

@@ -0,0 +1,58 @@
+import db from '../config/database';
+import { logger } from '../utils/logger';
+import { AdviceService } from '../domains/Strategy/AdviceService';
+
+export interface SocialTrend {
+  keyword: string;
+  platform: 'TikTok' | 'Instagram' | 'Pinterest';
+  growthRate: number; // 增长率
+  mentions: number; // 提及次数
+  relatedProducts: string[];
+}
+
+/**
+ * [BIZ_MKT_05] 基于社交热点趋势的爆款选品建议引擎
+ * @description 采集并分析社交媒体热词、标签及爆款视频，结合 AI 预测品类爆发点并推荐货源
+ */
+export class SocialTrendSourcingService {
+  /**
+   * 发现并处理社交趋势 (BIZ_MKT_05)
+   */
+  static async discoverTrends(tenantId: string): Promise<void> {
+    logger.info(`[SocialTrend] Discovering trends for Tenant: ${tenantId}`);
+
+    // 1. 模拟采集社交热点数据 (实际中应集成外部 API 或爬虫)
+    const trends = await this.mockCollectTrends();
+
+    for (const trend of trends) {
+      // 2. 识别高增长热词
+      if (trend.growthRate > 0.5) {
+        logger.info(`[SocialTrend] High growth trend detected: ${trend.keyword} (+${(trend.growthRate * 100).toFixed(0)}%)`);
+
+        // 3. 自动触发策略建议 (BIZ_AI_16-EXT)
+        await AdviceService.recordAdvice({
+          tenantId,
+          shopId: 'DEFAULT',
+          traceId: `TREND-${Date.now()}`,
+          insight: {
+            type: 'ARBITRAGE',
+            title: `Social Trend Alert: ${trend.keyword}`,
+            description: `The keyword "${trend.keyword}" is trending on ${trend.platform} with a ${ (trend.growthRate * 100).toFixed(0) }% growth rate. Potential for arbitrage.`,
+            impact: 'high',
+            confidence: 0.88,
+            suggestedAction: `Source products related to "${trend.keyword}" from 1688 and test on Shopify.`,
+            metadata: { keyword: trend.keyword, platform: trend.platform, growthRate: trend.growthRate, mentions: trend.mentions }
+          }
+        });
+      }
+    }
+  }
+
+  private static async mockCollectTrends(): Promise<SocialTrend[]> {
+    return [
+      { keyword: 'portable_espresso_maker', platform: 'TikTok', growthRate: 0.65, mentions: 12500, relatedProducts: [] },
+      { keyword: 'ergonomic_office_chair', platform: 'Instagram', growthRate: 0.2, mentions: 5400, relatedProducts: [] },
+      { keyword: 'smart_home_fragrance', platform: 'TikTok', growthRate: 0.8, mentions: 8900, relatedProducts: [] }
+    ];
+  }
+}