When a separating child's wife is foreign (أجنبي), 15% of the full
membership value (based on the chosen qualification) is added per
foreign spouse to the separation fee total.

- Add foreignSpouseCount param to calculateForChildSeparation
- Count foreign spouses from dep_spouses nationality field in controller
- Add foreign_spouse_fee column to transfer_requests
- Display surcharge in transfer show page breakdown
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>