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

.gitignore

@@ -0,0 +1,42 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Virtual environments
+venv/
+.venv/
+ENV/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# Compiled KFP pipelines
+*.yaml
+!pipelines/*.py
+
+# Local
+.env
+.env.local
+*.log