fix(ci): deploy-staging job 直接 scp 抖音 cookies 到 staging host，避免空占位覆盖镜像内 cookies

- ci-pipeline.yml: 在 .env scp 之后增加 douyin_cookies.txt scp
- ci_staging_deploy.sh: 简化逻辑，不再尝试从本地 repo 路径拷贝（脚本是通过管道 SSH 执行无本地文件）

scripts/ci_staging_deploy.sh

@@ -67,18 +67,12 @@ echo "✅ .env file found: $ENV_FILE ($(wc -l < "$ENV_FILE") lines)"
 mkdir -p "$GENERATED_DIR"
 mkdir -p "$LEGACY_ASSETS_DIR"
 mkdir -p "$(dirname "$COOKIES_FILE")"
-# 抖音 cookies 文件：优先使用 host 上已有的（>200B 视为真实），否则从 repo 拷贝
-# 镜像中已 baked-in 默认 cookies，但 host 挂载可在不重建镜像的情况下更新
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-REPO_COOKIES="$(dirname "$SCRIPT_DIR")/deploy/configs/douyin_cookies.txt"
+# 抖音 cookies 文件：CI workflow 已通过 scp 上传；如果不存在（非 CI 环境）则创建占位
 if [ ! -f "$COOKIES_FILE" ] || [ "$(wc -c < "$COOKIES_FILE" 2>/dev/null || echo 0)" -lt 200 ]; then
-  if [ -f "$REPO_COOKIES" ] && [ "$(wc -c < "$REPO_COOKIES" 2>/dev/null || echo 0)" -gt 200 ]; then
-    cp "$REPO_COOKIES" "$COOKIES_FILE"
-    echo "Copied Douyin cookies from repo to $COOKIES_FILE ($(wc -c < "$COOKIES_FILE") bytes)"
-  else
-    printf '# Netscape HTTP Cookie File\n# 抖音 cookies 占位，请从浏览器导出并替换此文件\n' > "$COOKIES_FILE"
-    echo "Created empty cookies placeholder at $COOKIES_FILE (Douyin extraction will 503)"
-  fi
+  printf '# Netscape HTTP Cookie File\n# 抖音 cookies 占位（CI 应通过 scp 上传真实 cookies）\n' > "$COOKIES_FILE"
+  echo "WARNING: Douyin cookies not found or too small at $COOKIES_FILE (extraction will 503)"
+else
+  echo "Douyin cookies ready: $COOKIES_FILE ($(wc -c < "$COOKIES_FILE") bytes)"
 fi
 
 # ── 写入 Staging Nginx 配置 ──