clean mcp schema for gemini models, update http mcp example to use gemini

examples/foundational/39c-mcp-run-http.py

@@ -16,6 +16,7 @@ from pipecat.pipeline.pipeline import Pipeline
 from pipecat.pipeline.runner import PipelineRunner
 from pipecat.pipeline.task import PipelineParams, PipelineTask
 from pipecat.processors.aggregators.openai_llm_context import OpenAILLMContext
+from pipecat.services.google.llm import GoogleLLMService
 from pipecat.services.cartesia.tts import CartesiaTTSService
 from pipecat.services.deepgram.stt import DeepgramSTTService
 from pipecat.services.mcp_service import MCPClient
@@ -58,7 +59,9 @@ async def run_example(transport: BaseTransport, _: argparse.Namespace, handle_si
         voice_id="71a7ad14-091c-4e8e-a314-022ece01c121",  # British Reading Lady
     )
 
-    llm = OpenAILLMService(api_key=os.getenv("OPENAI_API_KEY"), model="gpt-4o-mini")
+    llm = GoogleLLMService(
+        api_key=os.getenv("GOOGLE_API_KEY"), model="gemini-2.0-flash"
+    )
 
     try:
         # Github MCP docs: https://github.com/github/github-mcp-server