Replace Python numerical kernels with native C execution

frontend/src/App.tsx

@@ -461,16 +461,16 @@ type SimulationResult = {
   final: Record<string, number>;
   series: Record<string, number[]>;
   diagnostics: {
-    pressureFlow: {
+    pressureFlow?: {
       solveCount: number;
       maxScaledResidual: number;
       maxEvaluationsPerSolve: number;
     };
-    stream: {
+    stream?: {
       maxIterationsPerSolve: number;
     };
     stateCount: number;
-    sampleCount: number;
+    sampleCount?: number;
   };
 };
 
@@ -1259,7 +1259,7 @@ export function observeSimulationActivityWatchdog(
     },
   };
 }
-const SUPPORTED_SOLVER_METHODS = ["BDF", "Radau", "LSODA", "RK45", "RK23", "DOP853"];
+const SUPPORTED_SOLVER_METHODS = ["BDF", "RK45"];
 const simulationConfigLabels: Record<SimulationNumericKey, string> = {
   t_start: "起始时间",
   t_stop: "结束时间",
@@ -7374,7 +7374,7 @@ function FlowWorkbench() {
   ) => {
     const resultStatus = result.status ?? (result.success ? "completed" : "failed");
     const sampleCount = Math.min(
-      result.diagnostics.sampleCount,
+      result.diagnostics.sampleCount ?? result.series.time?.length ?? 0,
       result.series.time?.length ?? 0,
     );
     const hasUsableSamples = sampleCount >= 2;
@@ -7403,6 +7403,11 @@ function FlowWorkbench() {
       failed: `仿真异常终止，已保留计算至 ${simulatedUntil} s 的 ${sampleCount} 个采样点`,
     } as const;
     const statusMessage = statusMessages[resultStatus];
+    const maxScaledResidual = result.diagnostics.pressureFlow?.maxScaledResidual;
+    const residualMessage =
+      typeof maxScaledResidual === "number" && Number.isFinite(maxScaledResidual)
+        ? `；最大方程残差 ${formatNumber(maxScaledResidual)}`
+        : "";
 
     if (resultStatus === "completed") {
       setSimulationProgress({
@@ -7415,7 +7420,7 @@ function FlowWorkbench() {
       });
       appendConsoleEntry(
         "success",
-        `${statusMessage}，可在“结果”页签查看；最大方程残差 ${formatNumber(result.diagnostics.pressureFlow.maxScaledResidual)}`,
+        `${statusMessage}，可在“结果”页签查看${residualMessage}`,
       );
     } else {
       setSimulationProgress((current) => ({
@@ -7444,7 +7449,10 @@ function FlowWorkbench() {
       id: `simulation-${Date.now()}`,
       createdAt: new Date().toISOString(),
       project: cloneValue(project),
-      result: cloneValue(result),
+      result: cloneValue({
+        ...result,
+        diagnostics: { ...result.diagnostics, sampleCount },
+      }),
     };
     setResultSnapshot(nextSnapshot);
     storeResultSnapshot(nextSnapshot);

frontend/src/SimulationResultsView.tsx

@@ -146,12 +146,12 @@ type ResultPayload = {
         stateTransitionTimes?: number[];
       }>;
     };
-    pressureFlow: {
+    pressureFlow?: {
       solveCount: number;
       maxScaledResidual: number;
       maxEvaluationsPerSolve: number;
     };
-    stream: {
+    stream?: {
       maxIterationsPerSolve: number;
     };
     stateCount: number;