C内核流量计算方法优化，前端文件名称读取优化

app/simulation/backends.py

@@ -26,7 +26,7 @@ def simulation_config(simulation) -> SolveIVPConfig:
     # floors are emitted by native_codegen.tolerances; XML tolerance fields
     # remain a separate protocol change.
     return SolveIVPConfig(t_start=simulation.t_start, t_stop=simulation.t_stop,
-                         method=simulation.method, rtol=1e-7, max_step=simulation.max_step)
+                         method=simulation.method, rtol=1e-8, max_step=simulation.max_step)
 
 
 def simulate_network(network, simulation, *, progress_callback=None,