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

tests/gateway/test_qqbot.py

@@ -93,7 +93,7 @@ class TestQQAdapterInit:
 
     def test_name_property(self):
         adapter = self._make(app_id="a", client_secret="b")
-        assert adapter.name == "QQBOT"
+        assert adapter.name == "QQBot"
 
 
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