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

app/simulation/components/amesim/boundary/sources.py

@@ -5,6 +5,7 @@ from app.simulation.core.base import AlgebraicComponent
 from app.simulation.core.catalog import ComponentDisplaySpec, PortDisplaySpec
 from app.simulation.core.medium import IdealGasMedium
 from app.simulation.core.ports import PortDefinition
+from app.simulation.core.port_computation import ZERO_FLOW_SUPPLY
 
 class AmesimPnpl01(AlgebraicComponent):
     """AMESim PNPL01 zero pneumatic flow source.
@@ -15,7 +16,7 @@ class AmesimPnpl01(AlgebraicComponent):
     """
     MODEL_TYPE = 'amesim_pnpl01'
     MODEL_VERSION = '0.1.0'
-    PORTS = (PortDefinition.pneumatic('port_1', nominal_role='bidirectional'),)
+    PORTS = (PortDefinition.pneumatic('port_1', computation=ZERO_FLOW_SUPPLY),)
     PARAMETERS = ()
     RESULT_VARIABLES = ()
     DISPLAY = ComponentDisplaySpec(label='PNPL01 零气动流边界', library_id='amesim', category_id='boundary', symbol='amesim_pnpl01', ports=(PortDisplaySpec('port_1', 'left', order=10),), order=10)