fix(qqbot): stop routing file uploads through STT pipeline

gateway/platforms/qqbot/adapter.py

@@ -1797,16 +1797,14 @@ def _is_voice_content_type(content_type: str, filename: str) -> bool:
         fn = filename.strip().lower()
         if ct == "voice" or ct.startswith("audio/"):
             return True
+        # QQ file uploads have content_type="file".  Without this guard,
+        # any uploaded audio file (e.g. .wav, .mp3) would be misrouted into
+        # the STT pipeline and never be received as a normal file attachment.
+        if ct == "file":
+            return False
         _VOICE_EXTENSIONS = (
-            ".silk",
-            ".amr",
-            ".mp3",
-            ".wav",
-            ".ogg",
-            ".m4a",
-            ".aac",
-            ".speex",
-            ".flac",
+            ".silk", ".amr", ".mp3", ".wav", ".ogg",
+            ".m4a", ".aac", ".speex", ".flac",
         )
         if any(fn.endswith(ext) for ext in _VOICE_EXTENSIONS):
             return True

tests/gateway/test_qqbot.py

@@ -139,15 +139,24 @@ def test_voice_content_type(self):
     def test_audio_content_type(self):
         assert self._fn("audio/mp3", "file.mp3") is True
 
-    def test_voice_extension(self):
+    def test_voice_extension_fallback_when_content_type_empty(self):
+        """content_type='' with audio extension → True (extension fallback)."""
         assert self._fn("", "file.silk") is True
 
     def test_non_voice(self):
         assert self._fn("image/jpeg", "photo.jpg") is False
 
-    def test_audio_extension_amr(self):
+    def test_audio_extension_amr_fallback_when_content_type_empty(self):
+        """content_type='' with .amr extension → True (extension fallback)."""
         assert self._fn("", "recording.amr") is True
 
+    def test_file_upload_with_audio_extension(self):
+        """content_type='file' is never voice, even with audio extension."""
+        assert self._fn("file", "song.mp3") is False
+        assert self._fn("file", "audio-30251.instrumental..wav") is False
+        assert self._fn("file", "recording.silk") is False
+        assert self._fn("file", "voice.amr") is False
+
 
 # ---------------------------------------------------------------------------
 # Voice attachment SSRF protection