调度中心 rows now maintain 每日次数 + 时段偏好(自动晨间批次/上午/下午/
晚间) via dropdowns; POST /schedule-intent persists to schedule-plan.json
and immediately re-plans all times. Planner gains windows support: a
source with a preferred window gets all its runs evenly placed inside
06:30-11:30 / 12:00-17:30 / 18:00-21:30, outside the morning batch;
global gap/deadline math stays automatic. Applied: reuters-technology →
morning (06:30), freeing an overnight slot (everything shifts 40min
later, more slack before the 06:00 deadline).