perf(gateway): defer QQAdapter and YuanbaoAdapter imports via PEP 562

gateway/platforms/__init__.py

@@ -9,13 +9,37 @@
 """
 
 from .base import BasePlatformAdapter, MessageEvent, SendResult
-from .qqbot import QQAdapter
-from .yuanbao import YuanbaoAdapter
 
+# QQAdapter and YuanbaoAdapter were previously imported eagerly here, but
+# nothing in the codebase consumes ``from gateway.platforms import
+# QQAdapter`` (every real call site uses the long-form path
+# ``from gateway.platforms.qqbot import QQAdapter``). The eager imports
+# pulled in qqbot's chunked-upload + keyboards + onboard machinery and
+# yuanbao's websocket stack — about 48 ms wall and ~8 MB RSS on every
+# CLI invocation, even ones that never touch a gateway adapter.
+#
+# Use PEP 562 module ``__getattr__`` to keep the public re-export working
+# while deferring the actual import to first attribute access. This is
+# 100% backward-compatible for any external code that still imports the
+# adapters from the package root.
 __all__ = [
     "BasePlatformAdapter",
     "MessageEvent",
     "SendResult",
     "QQAdapter",
     "YuanbaoAdapter",
 ]
+
+
+def __getattr__(name):
+    if name == "QQAdapter":
+        from .qqbot import QQAdapter  # noqa: F401
+        return QQAdapter
+    if name == "YuanbaoAdapter":
+        from .yuanbao import YuanbaoAdapter  # noqa: F401
+        return YuanbaoAdapter
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
+
+
+def __dir__():
+    return sorted(__all__)