Close consecutive GL periods in sequence (batch month-end lock)

Closes each supplied period in order — the same closing-entry and retained-earnings effect as the single gl-periods close, applied per period. Aborts on the first failure (including any unresolved block-severity close blocker) and returns the per-period status so the caller can see which period broke. Signed-in accountants only: the service API key cannot use the batch lock (#2411); it closes one period at a time through the single gl-periods close.