前端进度条性能优化、仿真结束后后处理优化；后端C代码生成流程优化：先识别来源，再按照已知未知量需求排序，最后局部求解

tests/test_amesim_pneumatic_node_xml.py

@@ -42,21 +42,6 @@ def amesim_pn3node_project() -> ReactFlowProjectPayload:
                     physical_port("port_3", "bidirectional", "right"),
                 ],
             ),
-            component_node(
-                "pipe_1",
-                "pipe",
-                [
-                    physical_port("port_a", "inlet", "left"),
-                    physical_port("port_b", "outlet", "right"),
-                ],
-                {
-                    "length": 1.0,
-                    "diameter": 0.02,
-                    "lambda_darcy": 0.02,
-                    "p0": 100000.0,
-                    "T0": 300.0,
-                },
-            ),
             component_node(
                 "tank_1",
                 "tank",
@@ -87,9 +72,9 @@ def amesim_pn3node_project() -> ReactFlowProjectPayload:
         ],
         edges=[
             physical_edge("edge-1", "cylinder_1", "port_b", "orifice_1", "port_a"),
-            physical_edge("edge-2", "orifice_1", "port_b", "node_1", "port_2"),
-            physical_edge("edge-3", "node_1", "port_1", "pipe_1", "port_a"),
-            physical_edge("edge-4", "pipe_1", "port_b", "tank_1", "port_a"),
+            physical_edge("edge-2", "orifice_1", "port_b", "node_1", "port_1"),
+            # PN3NODE2 takes its reference temperature/pressure from storage.
+            physical_edge("edge-3", "node_1", "port_2", "tank_1", "port_a"),
             physical_edge("edge-5", "node_1", "port_3", "pipe_2", "port_a"),
             physical_edge("edge-6", "pipe_2", "port_b", "tank_2", "port_a"),
         ],