C内核流量计算方法优化，前端文件名称读取优化

.github/workflows/solver-regression.yml

@@ -93,7 +93,7 @@ jobs:
           python -W error::ResourceWarning -m unittest discover -s tests
       - name: Complete the 10 second skill fixture in native RK45
         run: |
-          python -m app.simulation.native_codegen tests/data/native-skill-test.xml --output-dir test/ci-skill --method RK45 --max-step 0.001 --rtol 1e-7 --runs 1 --solve-only
+          python -m app.simulation.native_codegen tests/fixtures/native-skill-test.xml --output-dir test/ci-skill --method RK45 --max-step 0.001 --rtol 1e-7 --runs 1 --solve-only
       - if: always()
         uses: actions/upload-artifact@v4
         with: