fix(backend): 商品公开页移除「在 App 中查看」链接

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJ1g8XV1YhhmHRzhwWEW7o

backend/internal/handler/public_page_test.go

@@ -57,9 +57,9 @@ func TestProductPage_SSR(t *testing.T) {
 	// OG 标签（og:url 指向 SSR 短链）
 	assert.Contains(t, body, `property="og:title"`)
 	assert.Contains(t, body, "/product/pub-ssr-001")
-	// 门店互跳 + App 兜底链接
+	// 门店互跳；「在 App 中查看」已移除（2026-07-07 用户拍板）
 	assert.Contains(t, body, "/shop/"+shop.Code)
-	assert.Contains(t, body, "/app/product/pub-ssr-001")
+	assert.NotContains(t, body, "/app/product/")
 	// 敏感字段零暴露（成本/进价永不出现在公开页）
 	for _, s := range []string{"cost", "purchase_price", "profit"} {
 		assert.NotContains(t, body, s, "公开页不得出现敏感字段名 %s", s)