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/system_xml.py

@@ -10,6 +10,7 @@ from typing import Literal
 from lxml import etree
 
 from app.simulation.core.ports import PortDefinition
+from app.simulation.core.port_computation import port_supply_issue, reference_supply_issues
 from app.simulation.performance import profile_phase
 from app.simulation.registry import COMPONENT_MODEL_REGISTRY, ParameterSpec
 from app.simulation.config import SolveIVPConfig
@@ -566,6 +567,8 @@ def _validate_connections(
     occupied_physical_ports: dict[tuple[str, str], str] = {}
     driven_signal_inputs: dict[tuple[str, str], str] = {}
     referenced_ports: set[tuple[str, str]] = set()
+    supply_ports: dict[tuple[str, str], PortDefinition] = {}
+    supply_adjacency: dict[tuple[str, str], tuple[str, str]] = {}
 
     for index, connection in enumerate(document.connections, start=1):
         path = f"/System/Connections/Connection[{index}]"
@@ -707,6 +710,19 @@ def _validate_connections(
                     connection.line,
                 )
             )
+        first_endpoint, second_endpoint = (item[0] for item in resolved_endpoints)
+        supply_issue = port_supply_issue(
+            first_port, second_port,
+            f"{first_endpoint.component}.{first_endpoint.port}",
+            f"{second_endpoint.component}.{second_endpoint.port}",
+        )
+        if supply_issue:
+            issues.append(_semantic_issue(supply_issue.code, supply_issue.message,
+                                          path, connection.line))
+        if first_port.kind == 'physical':
+            a, b = first_endpoint.key, second_endpoint.key
+            supply_ports[a], supply_ports[b] = first_port, second_port
+            supply_adjacency[a], supply_adjacency[b] = b, a
         if first_port.kind == "signal" and {
             first_port.nominal_role,
             second_port.nominal_role,
@@ -725,6 +741,7 @@ def _validate_connections(
         if spec is None:
             continue
         for port in _active_registered_ports(component):
+            supply_ports[component.id, port.name] = port
             if (component.id, port.name) not in referenced_ports:
                 issues.append(
                     _semantic_issue(
@@ -736,6 +753,12 @@ def _validate_connections(
                     )
                 )
 
+    for issue in reference_supply_issues(supply_ports, supply_adjacency):
+        component_id = issue.endpoint[0] if issue.endpoint else ''
+        issues.append(_semantic_issue(issue.code, issue.message,
+                                      f"/System/Components/Component[@id='{component_id}']",
+                                      None))
+
 
 def _validate_amesim_medium_references(
     document: SystemXmlDocument,