Submit a draft time entry for approval

POST /time-entries/:id/submit

Someone else's entry needs a key created by a manager or admin.

Permission: write:time_entry.

Add-on: requires the Illumera add-on. Without it the call returns 403 with reason: addon_required.

Plan: requires time tracking. When it is off the call returns 402 with reason: feature_disabled.

/time-entries/:id/submit