feat: Add voice assistant handler and Kubeflow pipeline

- voice_assistant.py: Standalone NATS handler with full RAG pipeline
- voice_assistant_v2.py: Handler-base implementation
- pipelines/voice_pipeline.py: KFP SDK pipeline definitions
- Dockerfiles for both standalone and handler-base versions

Pipeline: STT → Embeddings → Milvus → Rerank → LLM → TTS

Dockerfile.v2

@@ -0,0 +1,9 @@
+# Voice Assistant v2 - Using handler-base with audio support
+ARG BASE_TAG=local-audio
+FROM ghcr.io/billy-davies-2/handler-base:${BASE_TAG}
+
+WORKDIR /app
+
+COPY voice_assistant_v2.py ./voice_assistant.py
+
+CMD ["python", "voice_assistant.py"]