修改GraphRAG后端，另外两本小说入库

backend/app.py

@@ -1,5 +1,5 @@
 """
-大唐双龙传 GraphRAG — FastAPI 后端
+武侠三部曲 GraphRAG — FastAPI 后端
 
 端点:
   GET  /api/health    — 健康检查（含 Neo4j 连通性）
@@ -13,11 +13,11 @@ from fastapi.middleware.cors import CORSMiddleware
 from pydantic import BaseModel
 
 from graph_query import get_driver, get_graph_stats
-from graph_builder import build_graph
+from graph_builder import build_all_graphs
 from llm_router import answer_question
 import uvicorn
 
-app = FastAPI(title="大唐双龙传 GraphRAG API", version="1.0.0")
+app = FastAPI(title="武侠三部曲 GraphRAG API", version="1.1.0")
 
 app.add_middleware(
     CORSMiddleware,
@@ -37,6 +37,7 @@ class ChatRequest(BaseModel):
 
 class ImportRequest(BaseModel):
     clear: bool = False  # True = 先清空图谱再重新导入
+    novels: list[str] | None = None  # 默认导入 dtslz/ldj/tlbb
 
 
 # ── Endpoints ─────────────────────────────────────────────
@@ -62,10 +63,10 @@ def stats():
 
 @app.post("/api/import")
 def import_data(req: ImportRequest = ImportRequest()):
-    """导入所有卷数据到 Neo4j（耗时约 1-3 分钟，请勿重复调用）"""
+    """导入小说数据到 Neo4j（耗时约 1-3 分钟，请勿重复调用）"""
     driver = get_driver()
     try:
-        build_graph(driver, clear=req.clear)
+        build_all_graphs(driver, novels=req.novels, clear=req.clear)
         stats = get_graph_stats()
         return {"status": "ok", "stats": stats}
     except Exception as e: