fix: 修复 Linux 兼容性，添加原生构建依赖，忽略运行时数据

backend/routers/system.py

@@ -19,8 +19,8 @@ async def health_check():
     from dotenv import load_dotenv
     load_dotenv(env_path, override=False)
 
-    mineru_python = Path(os.getenv("MINERU_PYTHON", "F:/GraphRAGAgent/mineru_mvp/.venv/Scripts/python.exe"))
-    backend_python = Path(__file__).parent.parent / ".venv" / "Scripts" / "python.exe"
+    mineru_python = Path(os.getenv("MINERU_PYTHON", str(Path(__file__).parent.parent.parent / "mineru_mvp" / ".venv" / "bin" / "python")))
+    backend_python = Path(__file__).parent.parent / ".venv" / "bin" / "python"
     deepseek_key = os.getenv("DEEPSEEK_API_KEY", "")
     deepseek_url = os.getenv("DEEPSEEK_BASE_URL", "https://api.deepseek.com")
 
@@ -134,7 +134,7 @@ async def get_demo_data():
 
     if not nodes:
         # Fallback: load from existing graphrag_pipeline output
-        legacy_nodes_path = Path("F:/GraphRAGAgent/graphrag_pipeline/output/kg_nodes.json")
+        legacy_nodes_path = Path(__file__).parent.parent.parent / "backend" / "output" / "kg_nodes.json"
         legacy_edges_path = Path("F:/GraphRAGAgent/graphrag_pipeline/output/kg_edges.json")
         if legacy_nodes_path.exists():
             import json