refactor: 重构项目结构并优化类型定义

- 移除extension模块，将功能迁移至node-agent
- 修复类型导出问题，使用export type明确类型导出
- 统一数据库连接方式，从直接导入改为使用config/database
- 更新文档中的项目结构描述
- 添加多个服务的实用方法，如getForecast、getBalances等
- 修复类型错误和TS1205警告
- 优化RedisService调用方式
- 添加新的实体类型定义
- 更新审计日志格式，统一字段命名

server/src/services/TaxIncentivesService.ts

@@ -12,12 +12,16 @@ export class TaxIncentivesService {
    */
   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);
+    const result = await AIService.searchTaxPolicies({
+      countryCode: countryCode,
+      keywords: ['tax incentive', 'e-commerce'],
+      category: 'general'
+    });
     
-    for (const policy of policies) {
+    for (const policy of result.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 })
+        .where({ tenant_id: tenantId, country_code: countryCode, policy_name: policy.title })
         .first();
 
       if (!existing) {
@@ -25,21 +29,25 @@ export class TaxIncentivesService {
           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,
+            policy_name: policy.title,
+            description: policy.summary,
+            estimated_savings: policy.relevance * 1000,
             status: 'DISCOVERED'
           });
 
           // 审计记录
           await AuditService.log({
-            tenant_id: tenantId,
+            tenantId: 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 })
+            resourceType: 'TAX_INCENTIVE',
+            resourceId: id.toString(),
+            traceId: traceId,
+            userId: 'SYSTEM',
+            module: 'TAX_INCENTIVE',
+            source: 'node',
+            result: 'success',
+            afterSnapshot: { policyName: policy.title, relevance: policy.relevance },
+            metadata: { countryCode }
           });
         });
       }