feat(marketing): 新增营销图管理模块

- 新增 marketing 模块：model/repository/service/handler 四层架构
- 数据模型：marketing_categories、marketing_templates、marketing_user_downloads
- 小程序端接口：分类列表、模板列表/详情、下载记录、广告回调
- 管理后台接口：分类/模板 CRUD、下载统计（X-Admin-Token 鉴权）
- 路由注册：接入现有 AuthMiddleware，新增 AdminTokenMiddleware
- Web 管理后台：单页面 Vue3 + Element Plus（分类管理、模板管理、数据概览）

Closes #37, #38, #39, #40

Made-with: Cursor

cmd/api/main.go

@@ -19,6 +19,10 @@ import (
 	expiry "wx_service/internal/expiry"
 	lawyerhandler "wx_service/internal/lawyer/handler"
 	lawyerservice "wx_service/internal/lawyer/service"
+	marketinghandler "wx_service/internal/marketing/handler"
+	marketingmodel "wx_service/internal/marketing/model"
+	marketingrepo "wx_service/internal/marketing/repository"
+	marketingservice "wx_service/internal/marketing/service"
 	membershiphandler "wx_service/internal/membership/handler"
 	membershipmodel "wx_service/internal/membership/model"
 	membershipservice "wx_service/internal/membership/service"
@@ -65,6 +69,9 @@ func main() {
 		&smokemodel.SmokeAIAdviceUnlock{},
 		&smokemodel.SmokeAINextSmoke{},
 		&smokemodel.SmokeMotivationQuote{},
+		&marketingmodel.MarketingCategory{},
+		&marketingmodel.MarketingTemplate{},
+		&marketingmodel.MarketingDownload{},
 	); err != nil {
 		log.Fatalf("auto migrate failed: %v", err)
 	}
@@ -127,8 +134,18 @@ func main() {
 	}
 	expiryHandler := expiry.NewHandler(expiryService)
 
+	categoryRepo := marketingrepo.NewCategoryRepository(database.DB)
+	templateRepo := marketingrepo.NewTemplateRepository(database.DB)
+	downloadRepo := marketingrepo.NewDownloadRepository(database.DB)
+	categorySvc := marketingservice.NewCategoryService(categoryRepo)
+	templateSvc := marketingservice.NewTemplateService(templateRepo)
+	downloadSvc := marketingservice.NewDownloadService(downloadRepo, templateRepo)
+	marketingCategoryHandler := marketinghandler.NewCategoryHandler(categorySvc)
+	marketingTemplateHandler := marketinghandler.NewTemplateHandler(templateSvc)
+	marketingDownloadHandler := marketinghandler.NewDownloadHandler(downloadSvc)
+
 	// 6) 注册路由：把 URL 映射到 handler
-	routes.Register(router, database.DB, authHandler, videoHandler, smokeHandler, redeemCodeHandler, uploadHandler, oaOAuthHandler, sessionCache, lawyerHandler, expiryHandler)
+	routes.Register(router, database.DB, authHandler, videoHandler, smokeHandler, redeemCodeHandler, uploadHandler, oaOAuthHandler, sessionCache, lawyerHandler, expiryHandler, config.AppConfig.Admin.Token, marketingCategoryHandler, marketingTemplateHandler, marketingDownloadHandler)
 
 	// 7) 启动监听端口
 	addr := ":" + config.AppConfig.Server.Port