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/TaxIncentivesService.ts

@@ -0,0 +1,57 @@
+import db from '../config/database';
+import { AuditService } from './AuditService';
+import { AIService } from './AIService';
+
+/**
+ * [BIZ_FIN_16] 租户级税务优惠政策自动发现
+ * 负责扫描全球各地区的最新税务优惠（如 IOSS 减免、特定类目退税等），并自动提醒租户
+ */
+export class TaxIncentivesService {
+  /**
+   * 自动发现税务优惠
+   */
+  static async discoverIncentives(tenantId: string, countryCode: string, traceId: string): Promise<void> {
+    // 1. 获取该地区的最新税务政策 (模拟调用 AI 服务分析全球税法库)
+    const policies = await AIService.searchTaxPolicies(countryCode);
+    
+    for (const policy of policies) {
+      // 检查是否已记录
+      const existing = await db('cf_tax_incentives')
+        .where({ tenant_id: tenantId, country_code: countryCode, policy_name: policy.name })
+        .first();
+
+      if (!existing) {
+        await db.transaction(async (trx) => {
+          const [id] = await trx('cf_tax_incentives').insert({
+            tenant_id: tenantId,
+            country_code: countryCode,
+            policy_name: policy.name,
+            description: policy.description,
+            estimated_savings: policy.estimatedSavings,
+            status: 'DISCOVERED'
+          });
+
+          // 审计记录
+          await AuditService.log({
+            tenant_id: tenantId,
+            action: 'TAX_INCENTIVE_DISCOVERED',
+            target_type: 'TAX_INCENTIVE',
+            target_id: id.toString(),
+            trace_id: traceId,
+            new_data: JSON.stringify({ policyName: policy.name, estimatedSavings: policy.estimatedSavings }),
+            metadata: JSON.stringify({ countryCode })
+          });
+        });
+      }
+    }
+  }
+
+  /**
+   * 获取租户所有已发现的优惠
+   */
+  static async getIncentives(tenantId: string) {
+    return await db('cf_tax_incentives')
+      .where({ tenant_id: tenantId })
+      .orderBy('estimated_savings', 'desc');
+  }
+}