fix: teamsbot audio STT - pass channels and skipFallbacks for known PCM16 format

Co-authored-by: Cursor <cursoragent@cursor.com>

modules/features/teamsbot/service.py

@@ -417,6 +417,8 @@ class TeamsbotService:
                 audioContent=audioBytes,
                 language=self.config.language or "de-DE",
                 sampleRate=effectiveSampleRate,
+                channels=1,
+                skipFallbacks=True,
             )
 
             if sttResult and sttResult.get("success") and sttResult.get("text"):