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>
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# GraphRAG Studio — Project Conventions
## 1. 目录结构
- **前端代码** 统一放在 `frontend/` 目录下
- **后端代码** 统一放在 `backend/` 目录下
```
GraphRAGAgent/
├── frontend/ # 所有前端代码HTML/CSS/JS
├── backend/ # 所有后端代码FastAPI 服务)
└── docs/ # 规范文档
```
## 2. 环境变量与敏感配置
- 所有外部配置API Key、Base URL、Token 等)统一在 `backend/.env` 中管理
- `.env` 文件**禁止提交到 Git**,必须在 `.gitignore` 中忽略
- 提供 `backend/.env.example` 作为配置模板(不含真实值)
## 3. 后端虚拟环境
- 后端服务必须使用 `uv` 创建独立虚拟环境:
```bash
cd backend
uv venv
uv pip install -r requirements.txt
```
- 虚拟环境目录 `.venv/` 不提交到 Git