feat(adcenter): 接入广告中心，新增 /api/app/ads/click 并把广告拉取改用 versionUrl appId=12

- 广告拉取改走广告中心 /api/stat/advitise/v2/get（appId=12），locId→位置映射：1→Dialog 2→NineGrid 3→VideoTop+VideoDown 12→AppInfoA 13→AppInfoB
- 新增 POST /api/app/ads/click 接收 AdsClickInfo，异步转发到 /api/stat/advitise/v2/click；appId 透传，缺省回落到站点默认 appId=12
- app.yaml 增加 versionUrl 配置

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/router/ads.go

@@ -0,0 +1,11 @@
+package router
+
+import (
+	"videoweb/app/api/adsapi"
+
+	"github.com/gin-gonic/gin"
+)
+
+func adsRouter(r *gin.Engine) {
+	r.POST("/api/app/ads/click", adsapi.Click)
+}

app/router/gin.go

@@ -119,6 +119,7 @@ func registeRouter(r *gin.Engine) {
 	appInfoRouter(r)
 	translationRouter(r)
 	statcenterRouter(r)
+	adsRouter(r)
 	r.GET("/notpage", templatecache.WithCache(time.Minute*1), home.PageNotFound)
 
 }