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/admin_routes.go

@@ -13,6 +13,7 @@ func registerAdminRoutes(
 	categoryHandler *marketinghandler.CategoryHandler,
 	templateHandler *marketinghandler.TemplateHandler,
 	downloadHandler *marketinghandler.DownloadHandler,
+	adPlacementHandler *marketinghandler.AdPlacementHandler,
 ) {
 	if handler == nil {
 		return
@@ -107,11 +108,21 @@ func registerAdminRoutes(
 					marketing.PUT("/templates/:id", templateHandler.AdminUpdate)
 					marketing.DELETE("/templates/:id", templateHandler.AdminDelete)
 
-					marketing.GET("/stats", downloadHandler.AdminStats)
-					marketing.POST("/upload/oss/token", downloadHandler.AdminUploadToken)
+				marketing.GET("/stats", downloadHandler.AdminStats)
+				marketing.POST("/upload/oss/token", downloadHandler.AdminUploadToken)
 				marketing.POST("/upload", downloadHandler.AdminUploadFile)
+			}
+
+			if adPlacementHandler != nil {
+				ads := protected.Group("/marketing/ad-placements")
+				{
+					ads.GET("", adPlacementHandler.AdminList)
+					ads.POST("", adPlacementHandler.AdminCreate)
+					ads.PUT("/:id", adPlacementHandler.AdminUpdate)
+					ads.DELETE("/:id", adPlacementHandler.AdminDelete)
 				}
 			}
 		}
 	}
 }
+}