Add internal invoice tag to jobs for billing

Updated invoices missing an internal marker leave jobs unflagged and delay billing. Tagging those jobs as internal invoice helps billing staff prioritize and clear charges the same day.

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Overview

Unflagged internal invoices create avoidable billing delays and manual work; this flow flags jobs automatically when an invoice indicates internal billing so billing staff and dispatch coordinators can process those jobs the same day. It reduces manual tagging and speeds reconciliation before the next billing run.