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/pyproject.toml

@@ -0,0 +1,22 @@
+[project]
+name = "graphrag-studio-backend"
+version = "1.0.0"
+description = "GraphRAG Studio — FastAPI backend service"
+requires-python = ">=3.12"
+dependencies = [
+    "fastapi>=0.104.0",
+    "uvicorn[standard]>=0.24.0",
+    "python-multipart>=0.0.6",
+    "langextract[all]>=0.1.0",
+    "langchain>=0.2.0",
+    "langchain-openai>=0.1.0",
+    "langgraph>=0.1.0",
+    "networkx>=3.0",
+    "python-dotenv>=1.0.0",
+    "requests>=2.31.0",
+    "beautifulsoup4>=4.12.0",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"