feat: Linux one-click start pulls from Gitea ai_site

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

start.sh

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 # AI 建站 — Linux 一键启动（Docker Compose）
-# 用法：cd 项目根 && ./start.sh [--rebuild]
+# 用法：cd 项目根 && ./start.sh [--rebuild] [--no-pull]
+# 默认从 Gitea 拉取最新代码再启动（可用 --no-pull / AIJZ_SKIP_GIT_PULL=1 跳过）
 # 行尾：LF
 set -euo pipefail
 ROOT="$(cd "$(dirname "$0")" && pwd)"
@@ -9,21 +10,35 @@ cd "$ROOT"
 . "$ROOT/scripts/lib-aijz-deploy.sh"
 
 REBUILD=0
+DO_PULL=1
 for a in "$@"; do
   case "$a" in
     --rebuild|-r) REBUILD=1 ;;
+    --no-pull) DO_PULL=0 ;;
+    --pull) DO_PULL=1 ;;
     -h|--help)
-      echo "用法: $0 [--rebuild]"
+      echo "用法: $0 [--rebuild] [--no-pull|--pull]"
+      echo "  默认拉取: ${AIJZ_GIT_URL:-https://gitea.yuxindazhineng.com/whm/ai_site.git} 分支 ${GIT_BRANCH:-main}"
+      echo "  跳过拉取: --no-pull 或 AIJZ_SKIP_GIT_PULL=1"
       exit 0
       ;;
   esac
 done
+if [ "${AIJZ_SKIP_GIT_PULL:-0}" = "1" ]; then
+  DO_PULL=0
+fi
 
 echo "========================================"
 echo "  AI 建站 启动"
 echo "  路径: $ROOT"
 echo "========================================"
 
+if [ "$DO_PULL" = "1" ]; then
+  git_pull_hard
+else
+  echo "已跳过代码拉取（--no-pull / AIJZ_SKIP_GIT_PULL）"
+fi
+
 ensure_docker
 stack_up "$REBUILD"
 healthcheck