Rename *-local-vad.py example variants to *-locally-driven-turns.py

The "-local-vad" suffix was ambiguous now that local VAD has two
meanings in the realtime context: supplementary user-turn frames
broadcast alongside server-driven turns (commented-out opt-in in the
base examples), vs. local turn detection driving the conversation
end-to-end (server-side turn detection disabled, what these variant
files actually demonstrate). The new "-locally-driven-turns" suffix
matches the latter intent unambiguously.

Renames:

  realtime-openai-local-vad.py       → realtime-openai-locally-driven-turns.py
  realtime-gemini-live-local-vad.py  → realtime-gemini-live-locally-driven-turns.py
  realtime-grok-local-vad.py         → realtime-grok-locally-driven-turns.py
  realtime-inworld-local-vad.py      → realtime-inworld-locally-driven-turns.py

Plus the matching changelog fragments. Service docstrings and base
examples that referenced the old filenames now point at the new ones.

examples/realtime/realtime-gemini-live.py

@@ -147,7 +147,7 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     # decisions and can desynchronize in subtle ways.
     #
     # For local VAD driving the conversation (server VAD disabled), see
-    # `realtime-gemini-live-local-vad.py` instead.
+    # `realtime-gemini-live-locally-driven-turns.py` instead.
     #
     # from pipecat.audio.vad.silero import SileroVADAnalyzer
     # from pipecat.processors.aggregators.llm_response_universal import (

examples/realtime/realtime-openai.py

@@ -190,8 +190,8 @@ Remember, your responses should be short. Just one or two sentences, usually. Re
         # own UserStarted/StoppedSpeakingFrame from server VAD events, so
         # local VAD on the aggregator is unnecessary. realtime_service_mode
         # decouples context writes from turn frames and transcript-bound
-        # turn-end. See `realtime-openai-local-vad.py` for the variant
-        # that disables server VAD and drives turn detection locally.
+        # turn-end. See `realtime-openai-locally-driven-turns.py` for the
+        # variant that disables server VAD and drives turn detection locally.
         realtime_service_mode=RealtimeServiceModeConfig(),
     )