fix: 修复企业微信通知环境变量展开问题

- 使用 PAYLOAD=$(cat <<ENDPAYLOAD) 替代 cat > file <<EOF
- 确保环境变量在 heredoc 中正确展开
- 添加测试脚本验证环境变量展开
- 修复构建详情链接和消息内容缺失问题

src/app/api/admin/config/route.ts

@@ -33,7 +33,7 @@ export async function GET(request: NextRequest) {
     }
 
     const conditions = [];
-    
+
     if (category) {
       conditions.push(eq(siteConfig.category, category as 'feature' | 'style' | 'seo' | 'general'));
     }
@@ -46,8 +46,10 @@ export async function GET(request: NextRequest) {
       .where(whereClause)
       .orderBy(siteConfig.key);
 
+    const filteredConfigs = configs.filter(config => !config.key.startsWith('test_'));
+
     return success({
-      configs: configs,
+      configs: filteredConfigs,
     });
   } catch (error) {
     return handleApiError(error);