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>

.gitignore

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+# IDE / Editor
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Dependencies
+node_modules/
+.pnpm-store/
+
+# Build output
+dist/
+build/
+
+# Environment & secrets
+.env
+.env.local
+.env.*.local
+
+# Python
+__pycache__/
+*.pyc
+*.pyo
+.venv/
+*.egg-info/
+
+# Logs
+*.log
+
+# OMC
+.omc/
+**/.git_embedded_backup/
+
+# Claude Code personal config
+settings.json