feat(marketing): user profile update, ad placement management, logo limits

- Add PUT /auth/profile endpoint for nickname and avatar updates
- Add ad_placements table and CRUD admin API for managing ad units
- Add GET /marketing/ad-config public API for mini-program to fetch ad config
- Reduce logo limit from 10 to 3 per user, add 2MB file size validation

Made-with: Cursor

internal/routes/routes.go

@@ -40,6 +40,7 @@ func Register(
 	marketingTemplateHandler *marketinghandler.TemplateHandler,
 	marketingDownloadHandler *marketinghandler.DownloadHandler,
 	marketingUserLogoHandler *marketinghandler.UserLogoHandler,
+	marketingAdPlacementHandler *marketinghandler.AdPlacementHandler,
 	quitCheckinHandler *quitcheckinhandler.Handler,
 ) {
 	// Register 用来集中注册所有 HTTP 路由，便于工程结构更清晰：
@@ -65,13 +66,14 @@ func Register(
 		protected.Use(middleware.AuthMiddleware(db, sessionCache))
 		protected.Use(middleware.RequireUserMiddleware())
 		{
+			protected.PUT("/auth/profile", authHandler.UpdateProfile)
 			registerCommonRoutes(protected, uploadHandler)
 			registerRemoveWatermarkRoutes(api, protected, videoHandler)
 			registerMembershipRoutes(protected, redeemCodeHandler)
 			registerSmokeRoutes(protected, smokeHandler, quitPlanHandler)
 		}
 
-		registerMarketingRoutes(api, protected, adminToken, marketingCategoryHandler, marketingTemplateHandler, marketingDownloadHandler, marketingUserLogoHandler)
+		registerMarketingRoutes(api, protected, adminToken, marketingCategoryHandler, marketingTemplateHandler, marketingDownloadHandler, marketingUserLogoHandler, marketingAdPlacementHandler)
 	}
 
 	apiV2 := router.Group("/api/v2")
@@ -84,7 +86,7 @@ func Register(
 		}
 	}
 
-	registerAdminRoutes(router, adminHandler, marketingCategoryHandler, marketingTemplateHandler, marketingDownloadHandler)
+	registerAdminRoutes(router, adminHandler, marketingCategoryHandler, marketingTemplateHandler, marketingDownloadHandler, marketingAdPlacementHandler)
 
 	// 保质期提醒模块使用独立前缀 /api/expiry，与现有 /api/v1 并存。
 	expiryAPI := router.Group("/api/expiry")