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/indexing.py

@@ -0,0 +1,70 @@
+"""B 组：Indexing Pipeline（4 个端点）"""
+from fastapi import APIRouter
+from fastapi.responses import JSONResponse
+
+from models.schemas import APIResponse, StartIndexRequest
+from services import document_service as doc_svc
+from services import indexing_service as idx_svc
+
+router = APIRouter(prefix="/index", tags=["Indexing"])
+
+
+@router.post("/start", status_code=202)
+async def start_indexing(body: StartIndexRequest):
+    doc = doc_svc.get_document(body.doc_id)
+    if not doc:
+        return JSONResponse(
+            status_code=404,
+            content=APIResponse.err(2001, f"Document '{body.doc_id}' not found").model_dump(),
+        )
+    meta = idx_svc.start_indexing(body.doc_id)
+    return APIResponse.ok({
+        "job_id": meta["job_id"],
+        "doc_id": meta["doc_id"],
+        "status": meta["status"],
+        "stage": meta["stage"],
+        "created_at": meta["created_at"],
+    })
+
+
+@router.get("/status/{job_id}")
+async def get_job_status(job_id: str):
+    meta = idx_svc.get_job_status(job_id)
+    if not meta:
+        return JSONResponse(
+            status_code=404,
+            content=APIResponse.err(2002, f"Job '{job_id}' not found").model_dump(),
+        )
+    return APIResponse.ok(meta)
+
+
+@router.get("/result/{job_id}")
+async def get_job_result(job_id: str):
+    result = idx_svc.get_job_result(job_id)
+    if not result:
+        return JSONResponse(
+            status_code=404,
+            content=APIResponse.err(2002, f"Job '{job_id}' not found").model_dump(),
+        )
+    if result.get("status") not in ("done",) and "stats" not in result:
+        return JSONResponse(
+            status_code=400,
+            content=APIResponse.err(2003, f"Job '{job_id}' is still running (status={result.get('status')})").model_dump(),
+        )
+    return APIResponse.ok(result)
+
+
+@router.delete("/jobs/{job_id}")
+async def cancel_job(job_id: str):
+    meta = idx_svc.get_job_status(job_id)
+    if not meta:
+        return JSONResponse(
+            status_code=404,
+            content=APIResponse.err(2002, f"Job '{job_id}' not found").model_dump(),
+        )
+    ok, prev_status = idx_svc.cancel_job(job_id)
+    return APIResponse.ok({
+        "cancelled": True,
+        "job_id": job_id,
+        "previous_status": prev_status,
+    })