Add new functionality for admins to automatically deduct all settled
earnings when creating special deductions with amount=0, marking
each record to prevent duplicate deductions.
- Add OfflineSettlementDeduction model to track deducted records
- Add API endpoints for querying unprocessed settlements and executing batch deduction
- Add mode selection UI in admin-web pending-actions
- Add offline settlement card display in mobile-app special deduction page
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>