fix(backend): 修复 /app/product/ 分享无 OG 标签，描述分两行显示

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,17 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.48] - 2026-06-15
+
+### 修复
+- 修复分享 `/app/product/` 路径时微信爬虫拿不到 OG 标签的问题（nginx 补充该路径的代理规则）
+- 分享卡片描述规格/系列与门店名分两行显示
+
+## [1.0.47] - 2026-06-15
+
+### 修复
+- 微信分享卡片描述补充度数/系列信息，不再只显示规格
+
 ## [1.0.46] - 2026-06-15
 
 ### 修复

backend/internal/handler/public.go

@@ -343,14 +343,21 @@ func buildOGTitle(product model.Product) string {
 func buildProductOG(product model.Product, shopName, publicURL string) string {
 	title := buildOGTitle(product)
 
-	// og:description：规格（度数/香型/容量）| 门店名正品
+	// og:description：系列（度数/香型）· 规格（容量/单位）| 门店名正品
-	desc := product.Spec
+	var specParts []string
+	if product.Series != "" {
+		specParts = append(specParts, product.Series)
+	}
+	if product.Spec != "" {
+		specParts = append(specParts, product.Spec)
+	}
+	desc := strings.Join(specParts, " · ")
 	suffix := "正品"
 	if shopName != "" {
 		suffix = shopName + suffix
 	}
 	if desc != "" {
-		desc = desc + " | " + suffix
+		desc = desc + "\n" + suffix
 	} else {
 		desc = suffix
 	}

deploy/nginx-jiu.conf

@@ -55,6 +55,16 @@ server {
         proxy_read_timeout 30s;
     }
 
+    # Flutter 路由会把 /product/:id 重写为 /app/product/:id（base-href=/app/）
+    # 分享此 URL 时微信爬虫也需要 OG 标签 → 去掉 /app 前缀后转发后端
+    location ~ ^/app/product/ {
+        rewrite ^/app(/product/.+)$ $1 break;
+        proxy_pass         http://127.0.0.1:8080;
+        proxy_set_header   Host $host;
+        proxy_set_header   X-Real-IP $remote_addr;
+        proxy_read_timeout 30s;
+    }
+
     # 桌面客户端安装包下载（Windows .exe / macOS .zip）
     location /downloads/ {
         alias /opt/jiu/downloads/;