docs: add generic test_dataset.json for evaluation examples
Test cases with generic examples about:
- LightRAG framework features and capabilities
- RAG system architecture and components
- Vector database support (ChromaDB, Neo4j, Milvus, etc.)
- LLM provider integrations (OpenAI, Anthropic, Ollama, etc.)
- RAG evaluation metrics explanation
- Deployment options (Docker, FastAPI, direct integration)
- Knowledge graph-based retrieval concepts
Changes:
- Added generic test_dataset.json with 8 LightRAG-focused test cases
- File added with git add -f to override test_* pattern
This provides realistic, reusable examples for users testing their
LightRAG deployments and helps demonstrate the evaluation framework.
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