Bug: Task first run executes outside working time window

Bug Description

When a scheduled task runs for the first time, it executes immediately regardless of the configured time window.

Steps to Reproduce

1. Configure a schedule with time window (e.g., 06:00-23:00)
2. Set target_node=my2 for the schedule
3. Enable the schedule outside of working hours (e.g., at 01:20)
4. Observe that the task executes immediately

Expected Behavior

Task should wait until the time window opens (06:00) before first execution.

Actual Behavior

Task executes immediately at 01:20, outside the configured 06:00-23:00 window.

Log Evidence

2026-01-15 01:20:31 Executing job TaskMcfSyncV2
2026-01-15 01:20:32 Job completed successfully
2026-01-15 01:20:32 New Job [TaskMcfSyncV2] scheduled for: 2026-01-15T06:00:00+02:00

Note: After first run, next job is correctly scheduled within the time window (06:00).

Affected Components

• JobExecutorService::executePendingJobs()
• Schedule::getNextScheduledRunTime() or ScheduleService::calculatePatternNextRunTime()

Suggested Fix

When creating/scheduling a job, validate that scheduled_for falls within the time window. If not, calculate the next valid time within the window.