Add automatic CPA Management API import after mint

Upload xai-*.json to POST /v0/management/auth-files when cpa_auto_import_remote is enabled. Failures are logged only and never block registration.

.env.example

@@ -26,3 +26,10 @@ GROK2API_APP_KEY=
 # 代理（config.json 的 proxy / cpa_proxy 为空时会回退到这些）
 # https_proxy=http://127.0.0.1:7890
 # http_proxy=http://127.0.0.1:7890
+
+# ===== CPA 远程自动导入（Management API）=====
+# 写出 xai-*.json 后 POST 到 {CPA_REMOTE_BASE}/v0/management/auth-files
+# 需同时在 config.json 设 cpa_auto_import_remote=true，或仅用环境变量时也要打开该开关
+# CPA_REMOTE_BASE=http://127.0.0.1:8317
+# CPA_REMOTE_PASSWORD=
+# 兼容别名：CPA_MANAGEMENT_PASSWORD / MANAGEMENT_PASSWORD