feat: 扫码商品详情页重设计 + 宣传主页 + nginx 路由完善

- public_product_screen: 1:1 复刻设计稿，新增商品介绍、批次防伪（自定义圆形印章）、完整商品参数表、门店营业时间、页脚链接
- app_theme: 完整品牌色系（brand/gray/accent/semantic）
- shop model: 新增 business_hours 字段，public 接口同步返回
- nginx: 新增 /product/ → Flutter app 扫码入口，修复 /docs /download html 后缀兼容
- web/: 新增宣传主页、功能页、文档页、扫码 HTML 及设计资源
- app_shell: 界面优化

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

.gitea/workflows/deploy.yml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Build Flutter Web
         working-directory: client
-        run: flutter build web --release --dart-define=BASE_URL=https://jiu.51yanmei.com --dart-define=PUBLIC_URL=https://jiu.51yanmei.com
+        run: flutter build web --release --base-href=/app/ --dart-define=BASE_URL=https://jiu.51yanmei.com --dart-define=PUBLIC_URL=https://jiu.51yanmei.com
 
       - name: Package & Create Forgejo Release
         env:
@@ -75,6 +75,8 @@ ${RECENT_LOGS}"
           scp -O -i ~/.ssh/ec2_deploy.pem backend/jiu-server ${EC2_USER}@${EC2_HOST}:/tmp/jiu-server
           rsync -avz --delete -e "ssh -i ~/.ssh/ec2_deploy.pem" \
             client/build/web/ ${EC2_USER}@${EC2_HOST}:/tmp/jiu-web-new/
+          rsync -avz --delete -e "ssh -i ~/.ssh/ec2_deploy.pem" \
+            web/ ${EC2_USER}@${EC2_HOST}:/tmp/jiu-marketing-new/
           ssh -i ~/.ssh/ec2_deploy.pem ${EC2_USER}@${EC2_HOST} << 'ENDSSH'
             sudo systemctl stop jiu
             cp /tmp/jiu-server /opt/jiu/backend/jiu-server
@@ -87,6 +89,9 @@ ${RECENT_LOGS}"
             rm -rf /opt/jiu/web-old
             mv /opt/jiu/web /opt/jiu/web-old 2>/dev/null || true
             mv /tmp/jiu-web-new /opt/jiu/web
+            mkdir -p /opt/jiu/marketing
+            rsync -a --delete /tmp/jiu-marketing-new/ /opt/jiu/marketing/
+            rm -rf /tmp/jiu-marketing-new
             sudo nginx -s reload
           ENDSSH