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

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

scripts/git-sync.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+# Синхронизация с origin/main (исправляет detached HEAD)
+set -euo pipefail
+
+source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/shop-root.sh"
+
+if [ ! -d .git ]; then
+  echo "Ошибка: в $SHOP_ROOT нет .git — нужен полный clone:"
+  echo "  git clone https://git.evilfox.cc/test/shop10.git /opt/shop/shop10"
+  exit 1
+fi
+
+git config --global --add safe.directory "$SHOP_ROOT" 2>/dev/null || true
+
+echo "=== git sync: $SHOP_ROOT ==="
+git fetch origin
+
+if git symbolic-ref -q HEAD >/dev/null 2>&1; then
+  BRANCH=$(git branch --show-current)
+  echo "Текущая ветка: ${BRANCH:-?}"
+else
+  echo "Состояние: detached HEAD ($(git rev-parse --short HEAD))"
+  BRANCH=""
+fi
+
+if [ "$BRANCH" != "main" ]; then
+  if git show-ref --verify --quiet refs/remotes/origin/main; then
+    git checkout -B main origin/main
+  elif git show-ref --verify --quiet refs/heads/main; then
+    git checkout main
+  else
+    echo "Ветка main не найдена на origin"
+    exit 1
+  fi
+fi
+
+git pull origin main
+echo "OK: $(git log -1 --oneline)"