Address code review feedback - improve null checks

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

back/config/util.ts

@@ -398,8 +398,8 @@ export function psTree(pid: number): Promise<number[]> {
 }
 
 export function isPidRunning(pid: number): boolean {
-  // Validate PID is a positive integer
-  if (!pid || pid <= 0 || !Number.isInteger(pid)) {
+  // Validate PID: must be a positive integer
+  if (pid == null || pid <= 0 || !Number.isInteger(pid)) {
     return false;
   }
   

back/loaders/initData.ts

@@ -143,7 +143,9 @@ export default async () => {
       continue;
     }
     // 收集需要重置的任务 ID
-    idsToReset.push(cron.id!);
+    if (cron.id) {
+      idsToReset.push(cron.id);
+    }
   }
   
   // 批量更新所有需要重置的任务