Allow CPA_AUTO_IMPORT_REMOTE from .env

Enable remote CPA import via env flag with priority over config.json, and load project .env when resolving remote settings.

config.example.json

@@ -131,7 +131,7 @@
   "cpa_copy_to_hotload": false,
   "// cpa_hotload_dir": "CPA 容器/进程挂载的 auth-dir（copy_to_hotload=true 时生效）",
   "cpa_hotload_dir": "",
-  "// cpa_auto_import_remote": "写出 xai-*.json 后是否自动 POST 到 CPA Management API 导入",
+  "// cpa_auto_import_remote": "写出 xai-*.json 后是否自动 POST 到 CPA Management API 导入。也可在 .env 用 CPA_AUTO_IMPORT_REMOTE=1/0（env 优先）",
   "cpa_auto_import_remote": false,
   "// cpa_remote_base": "CPA 根地址，只填到端口即可，如 http://127.0.0.1:8317（程序自动拼 /v0/management/auth-files）",
   "cpa_remote_base": "",