fix: QQBot missing integration points, timestamp parsing, test fix

- Add Platform.QQBOT to _UPDATE_ALLOWED_PLATFORMS (enables /update command)
- Add 'qqbot' to webhook cross-platform delivery routing
- Add 'qqbot' to hermes dump platform detection
- Fix test_name_property casing: 'QQBot' not 'QQBOT'
- Add _parse_qq_timestamp() for ISO 8601 + integer ms compatibility
  (QQ API changed timestamp format — from PR #2411 finding)
- Wire timestamp parsing into all 4 message handlers

hermes_cli/dump.py

@@ -131,6 +131,7 @@ def _configured_platforms() -> list[str]:
         "wecom": "WECOM_BOT_ID",
         "wecom_callback": "WECOM_CALLBACK_CORP_ID",
         "weixin": "WEIXIN_ACCOUNT_ID",
+        "qqbot": "QQ_APP_ID",
     }
     return [name for name, env in checks.items() if os.getenv(env)]