fix: git-sync для detached HEAD, shop-root требует .git

Co-authored-by: Cursor <cursoragent@cursor.com>

wiki/Troubleshooting.md

@@ -30,6 +30,28 @@ sudo bash scripts/quick-deploy-ubuntu.sh
 bash /opt/shop/shop10/scripts/server-update.sh
 ```
 
+## git: You are not currently on a branch / not a git repository
+
+Клон на теге (detached HEAD) или обновление из `/opt/shop` вместо `/opt/shop/shop10`:
+
+```bash
+cd /opt/shop/shop10
+git status
+bash scripts/git-sync.sh
+bash scripts/server-update.sh
+```
+
+Если `fatal: not a git repository` в `/opt/shop/shop10`:
+
+```bash
+ls -la /opt/shop/shop10/.git
+# нет .git — заново:
+mv /opt/shop/shop10 /opt/shop/shop10.bak.$(date +%s)
+git clone https://git.evilfox.cc/test/shop10.git /opt/shop/shop10
+cp /opt/shop/shop10.bak.*/.env /opt/shop/shop10/.env 2>/dev/null || cp /opt/shop/shop10/.env.example /opt/shop/shop10/.env
+bash /opt/shop/shop10/scripts/server-update.sh
+```
+
 ## scripts/server-update.sh: No such file or directory
 
 Вы не в каталоге репозитория или клон в подпапке (например `/opt/shop/shop10`):