Add one-click start scripts for Linux and Windows

- start.sh: Linux/Mac one-click launcher
- start.bat: Windows one-click launcher
- Both scripts auto-detect/install:
  - Python 3.13+
  - uv package manager
  - Chrome/Chromium browser
  - Sync Python dependencies
  - Create .env/config.json from templates if missing
- Default to unlimited accounts (--count 0)
- Pass through CLI args for custom runs

register_cli.py

@@ -282,8 +282,21 @@ def register_one(
             break
         except Exception as exc:
             msg = str(exc)
-            if ("未收到验证码" in msg or "验证码" in msg) and mail_try < max_mail_retry:
-                log(worker_id, f"! 本邮箱未取到验证码，换邮箱重试: {msg}")
+            # Retry whole email stage on: no OTP mail, submit never reached code page, CF/rate limit
+            retryable = any(
+                key in msg
+                for key in (
+                    "未收到验证码",
+                    "验证码",
+                    "未进入验证码页",
+                    "邮箱提交被拒绝",
+                    "rate-limited",
+                    "rate_limited",
+                    "Turnstile",
+                )
+            )
+            if retryable and mail_try < max_mail_retry:
+                log(worker_id, f"! 邮箱阶段可重试，换邮箱/浏览器: {msg}")
                 _mark_email_stage_error(email, msg)
                 try:
                     reg.restart_browser(log_callback=lambda m: log(worker_id, m))