fix(cron): fix timeout, add timestamp validation, enable file sync

Fixes #7667

Task 1: Fix cron operation timeouts
- Increase default gateway tool timeout from 10s to 30s
- Increase cron-specific tool timeout to 60s
- Increase CLI default timeout from 10s to 30s
- Prevents timeouts when gateway is busy with long-running jobs

Task 2: Add timestamp validation
- New validateScheduleTimestamp() function in validate-timestamp.ts
- Rejects atMs timestamps more than 1 minute in the past
- Rejects atMs timestamps more than 10 years in the future
- Applied to both cron.add and cron.update operations
- Provides helpful error messages with current time and offset

Task 3: Enable file sync for manual edits
- Track file modification time (storeFileMtimeMs) in CronServiceState
- Check file mtime in ensureLoaded() and reload if changed
- Recompute next runs after reload to maintain accuracy
- Update mtime after persist() to prevent reload loop
- Dashboard now picks up manual edits to ~/.openclaw/cron/jobs.json

src/cron/service/state.ts

@@ -48,6 +48,8 @@ export type CronServiceState = {
   running: boolean;
   op: Promise<unknown>;
   warnedDisabled: boolean;
+  storeLoadedAtMs: number | null;
+  storeFileMtimeMs: number | null;
 };
 
 export function createCronServiceState(deps: CronServiceDeps): CronServiceState {
@@ -58,6 +60,8 @@ export function createCronServiceState(deps: CronServiceDeps): CronServiceState
     running: false,
     op: Promise.resolve(),
     warnedDisabled: false,
+    storeLoadedAtMs: null,
+    storeFileMtimeMs: null,
   };
 }