refactor: remove legacy storage implementations and k8s deployment
Remove deprecated storage backends and Kubernetes deployment configuration:
- Delete unused storage implementations: FAISS, JSON, Memgraph, Milvus, MongoDB, Nano Vector DB, Neo4j, NetworkX, Qdrant, Redis
- Remove Kubernetes deployment manifests and installation scripts
- Delete legacy examples for deprecated backends
- Consolidate to PostgreSQL-only storage backend
Streamline dependencies and add new capabilities:
- Remove deprecated code documentation and migration guides
- Add full-text search caching layer with FTS cache module
- Implement metrics collection and monitoring pipeline
- Add explain and metrics API routes
- Simplify configuration with PostgreSQL-focused setup
Update documentation and configuration:
- Rewrite README to focus on supported features
- Update environment and configuration examples
- Remove Kubernetes-specific documentation
- Add new utility scripts for PDF uploads and pipeline monitoring
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