C内核流量计算方法优化，前端文件名称读取优化

tests/test_native_codegen.py

@@ -22,7 +22,7 @@ from app.simulation.config import SolverActivityTracker
 from app.system_xml import validate_system_xml_document
 
 ROOT = Path(__file__).resolve().parents[1]
-FIXTURE = ROOT / "tests/data/native-skill-test.xml"
+FIXTURE = ROOT / "tests/fixtures/native-skill-test.xml"
 
 
 def network(xml=None):
@@ -76,7 +76,8 @@ class NativeExecutionTests(unittest.TestCase):
     def test_cache_and_standalone_executable_without_python_path(self):
         cached = build_native(self.program)
         self.assertTrue(cached.cache_hit)
-        env = {**os.environ, "PATH": str(Path(os.environ["SystemRoot"]) / "System32")}
+        isolated_path = str(Path(os.environ["SystemRoot"]) / "System32") if os.name == "nt" else str(self.root / "no-path")
+        env = {**os.environ, "PATH": isolated_path}
         r = subprocess.run([str(cached.executable), "--init"], env=env, cwd=self.root,
                            capture_output=True, text=True, check=True)
         self.assertEqual(len(json.loads(r.stdout)), 12)