GraphRAG Studio — initial commit: multimodal RAG system with KG visualization

Full-stack application for document-to-knowledge-graph pipeline:
- Backend: FastAPI + LangGraph ReAct agent + DeepSeek + MinerU parsing
- Frontend: React 19 + Vite + D3.js + shadcn/ui
- Pipeline: MinerU parsing → LangExtract entity extraction → KG building

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/output/8456b615_sample_graphrag_overview/parse_summary.json

@@ -0,0 +1,10 @@
+{
+  "total_blocks": 32,
+  "type_distribution": {
+    "text": 31,
+    "table": 1
+  },
+  "total_pages": 4,
+  "text_block_count": 31,
+  "table_block_count": 1
+}