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/routers/documents.py

@@ -0,0 +1,71 @@
+"""A 组：文档管理（4 个端点）"""
+from fastapi import APIRouter, File, Form, HTTPException, UploadFile
+from fastapi.responses import JSONResponse
+
+from models.schemas import APIResponse
+from services import document_service as svc
+
+router = APIRouter(prefix="/documents", tags=["Documents"])
+
+
+@router.post("/upload", status_code=200)
+async def upload_document(
+    file: UploadFile = File(...),
+    language: str = Form("ch"),
+    enable_formula: bool = Form(True),
+    enable_table: bool = Form(True),
+):
+    content = await file.read()
+    ok, code, msg = svc.validate_upload(file.filename or "", len(content))
+    if not ok:
+        return JSONResponse(
+            status_code=400,
+            content=APIResponse.err(code, msg).model_dump(),
+        )
+    doc = svc.save_upload(file.filename or "upload", content, language, enable_formula, enable_table)
+    # Remove internal field
+    doc.pop("upload_filename", None)
+    return APIResponse.ok(doc)
+
+
+@router.get("/{doc_id}")
+async def get_document(doc_id: str):
+    doc = svc.get_document(doc_id)
+    if not doc:
+        return JSONResponse(
+            status_code=404,
+            content=APIResponse.err(2001, f"Document '{doc_id}' not found").model_dump(),
+        )
+    doc.pop("upload_filename", None)
+    return APIResponse.ok(doc)
+
+
+@router.get("")
+async def list_documents(
+    page: int = 1,
+    page_size: int = 20,
+    status: str | None = None,
+    format: str | None = None,
+):
+    page_size = min(page_size, 100)
+    result = svc.list_documents(page, page_size, status, format)
+    for item in result["items"]:
+        item.pop("upload_filename", None)
+    return APIResponse.ok(result)
+
+
+@router.delete("/{doc_id}")
+async def delete_document(doc_id: str):
+    doc = svc.get_document(doc_id)
+    if not doc:
+        return JSONResponse(
+            status_code=404,
+            content=APIResponse.err(2001, f"Document '{doc_id}' not found").model_dump(),
+        )
+    ok, removed_nodes, removed_edges = svc.delete_document(doc_id)
+    return APIResponse.ok({
+        "deleted": True,
+        "doc_id": doc_id,
+        "removed_nodes": removed_nodes,
+        "removed_edges": removed_edges,
+    })