Add Gmail+Email Worker hybrid mail path and private runtime config

Prefer Cloudflare Worker KV for verification codes with optional short IMAP
fallback disabled for private deploy; track config.json/.env for private repo.
Also add worker project, protocol mint backoff, and fail-fast Turnstile/mail
timeouts from batch runs.

.env

@@ -0,0 +1,28 @@
+# Grok 注册机 - 本地环境变量（勿提交 git）
+# 真实进程环境变量优先于本文件；多数项也可写在 config.json
+
+# ===== Gmail IMAP（email_provider=gmail）=====
+# 密码填 Gmail「应用专用密码」，不是登录密码
+GMAIL_USER=你的Gmail@gmail.com
+GMAIL_PASSWORD=xxxx xxxx xxxx xxxx
+
+# ===== CloudMail（email_provider=cloudmail 时再填）=====
+# CLOUDMAIL_URL=https://mail.example.com
+# CLOUDMAIL_ADMIN_EMAIL=admin@example.com
+# CLOUDMAIL_PASSWORD=
+
+# ===== grok2api Admin（自动导入 SSO 池时）=====
+# GROK2API_APP_KEY=
+
+# ===== CPA 远程自动导入（Management API）=====
+# 1=开启，0=关闭（可覆盖 config.json 的 cpa_auto_import_remote）
+CPA_AUTO_IMPORT_REMOTE=1
+# 地址只填根，如 http://127.0.0.1:8317
+CPA_REMOTE_BASE=https://cpaai.qxy1828.com/
+CPA_REMOTE_PASSWORD=sk-fuLgIiBOn6A7rYrMm
+
+# ===== 可选 =====
+# API_REVERSE_TOOLS=
+# CPA_EXPORT=1
+# https_proxy=http://127.0.0.1:7890
+# http_proxy=http://127.0.0.1:7890