docs(inward): document timed service charging units Adds "Admin — Timed Service Charging Units" covering One Time Fee, Per Minute, Per Hour and Per Day: what Duration and Over Shoot mean in each unit, worked setup steps for a per-minute and a one-time charge, what the billed amounts look like on the consume screen and the interim bill, and how the same units apply to room charge blocks. Updates the Timed Item Fees field table on the Inpatient Timed Services page and links the two articles together.