fix(hil): 修复实物电阻参数不影响仿真的问题

- modelicaExporter: gain 字段从 paramValues 读取实际参数值 (R/C/L/V0)，
  而非仅对 switch 类型生效
- useProjectStore: FMU 缓存根据 .mo 代码变化智能失效，
  避免参数修改后仍复用旧 FMU

src/hooks/useProjectStore.js

@@ -31,6 +31,7 @@ function persistProjects(projects) {
     if (clean.hilResult) {
       clean.hilResult = { ...clean.hilResult };
       delete clean.hilResult.csvData;
+      delete clean.hilResult.moCode;
     }
     return clean;
   });
@@ -324,8 +325,10 @@ const useProjectStore = create((set, get) => ({
         return;
       }
 
-      // 调用后端启动 HIL（复用已有 FMU 跳过编译）
-      const cachedFmu = project.hilResult?.fmuPath || '';
+      // 仅当 .mo 代码未变时复用已有 FMU，否则重新编译
+      const prevCode = project.hilResult?.moCode || '';
+      const codeChanged = exported.code !== prevCode;
+      const cachedFmu = (!codeChanged && project.hilResult?.fmuPath) ? project.hilResult.fmuPath : '';
       const resp = await startHilSession({
         moCode: exported.code,
         modelName,
@@ -342,6 +345,7 @@ const useProjectStore = create((set, get) => ({
           message: resp.message,
           sessionId: resp.data?.session_id,
           fmuPath: resp.data?.fmu_path,
+          moCode: exported.code,  // 记录当前 .mo 代码，用于下次判断是否需要重新编译
           ports: resp.data?.ports,
           status: resp.data?.status,
           errorDetail: resp.data?.error_detail,

src/utils/modelicaExporter.js

@@ -410,9 +410,22 @@ export function exportToModelicaHIL(data, modelName = 'Circuit') {
         fmuVarPrefix: instanceName,
         controlVar: mapping?.controlVar ? `${instanceName}.${mapping.controlVar}` : '',
         topic: `/${toMoId(modelName)}/${instanceName}`,
-        gain: simModeMap[type] === 'switch'
-          ? ((() => { const v = node.data?.paramValues?.closed; return v === true || v === 'true' ? 1 : 0; })())
-          : undefined,
+        gain: (() => {
+          if (simModeMap[type] === 'switch') {
+            const v = node.data?.paramValues?.closed;
+            return v === true || v === 'true' ? 1 : 0;
+          }
+          // 非 switch: 从 paramValues 读取主要参数值 (R/C/L/V0)
+          const primaryKey = { resistor: 'R', capacitor: 'C', inductor: 'L', voltage_source: 'V0' }[type];
+          if (primaryKey) {
+            const raw = node.data?.paramValues?.[primaryKey];
+            if (raw != null && raw !== '') {
+              const num = parseEngValue(raw);
+              return num != null ? num : 1.0;
+            }
+          }
+          return 1.0;
+        })(),
       });
     }
   });