test(dingtalk): cover QR device-flow auth + OpenClaw branding disclosure

Adds 15 regression tests for hermes_cli/dingtalk_auth.py covering:
  * _api_post — network error mapping, errcode-nonzero mapping, success path
  * begin_registration — 2-step chain, missing-nonce/device_code/uri
    error cases
  * wait_for_registration_success — success path, missing-creds guard,
    on_waiting callback invocation
  * render_qr_to_terminal — returns False when qrcode missing, prints
    when available
  * Configuration — BASE_URL default + override, SOURCE default

Also adds a one-line disclosure in dingtalk_qr_auth() telling users
the scan page will be OpenClaw-branded. Interim measure: DingTalk's
registration portal is hardcoded to route all sources to /openapp/
registration/openClaw, so users see OpenClaw branding regardless of
what 'source' value we send. We keep 'openClaw' as the source token
until DingTalk-Real-AI registers a Hermes-specific template.

Also adds meng93 to scripts/release.py AUTHOR_MAP.

hermes_cli/dingtalk_auth.py

@@ -238,6 +238,8 @@ def dingtalk_qr_auth() -> Optional[Tuple[str, str]]:
 
     print()
     print_info("  Initializing DingTalk device authorization...")
+    print_info("  Note: the scan page is branded 'OpenClaw' — DingTalk's")
+    print_info("        ecosystem onboarding bridge. Safe to use.")
 
     try:
         reg = begin_registration()