Fix service settings init ordering and example bugs

- Speechmatics: move config build after super().__init__ and settings
  delta so turn_detection_mode (e.g. ADAPTIVE) takes effect
- Google STT: fix example passing bare Language enum instead of list
- Google TTS: add missing explicit defaults for all custom settings fields
- Soniox: fix accidental tuple wrapping of STT service in example
- Speechmatics examples: fix system->user role in kick-off messages
- Deepgram Flux: move tag from settings to __init__ (billing metadata)
- ElevenLabs STT: default tag_audio_events to None (use API default)
- Fal STT: simplify language default handling
- Google TTS: rename GoogleStreamTTSSettings to GoogleTTSSettings

examples/foundational/07n-interruptible-google.py

@@ -55,8 +55,9 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
 
     stt = GoogleSTTService(
         settings=GoogleSTTSettings(
-            languages=Language.EN_US,
-            model="chirp_3",
+            languages=[Language.EN_US],
+            # Add model to use a specific model
+            # model="chirp_3",
         ),
         credentials=os.getenv("GOOGLE_TEST_CREDENTIALS"),
         location="us",