- Add ExpenseStatus and ExpensePaymentMethod enums
- Add Vendor model (@@unique([tenantId, name]))
- Add ExpenseCategory model with accountCode linking to COA
- Add Expense model with approval workflow and JE reference
- Add User relations: createdExpenses, approvedExpenses
- Add COA accounts 5080 Fuel/Transportation, 5085 Rent Expense (31 total)
- Seed 9 default expense categories in createTenant transaction
- Add Vendor subject to CASL types, Expense/Vendor permissions for OFFICE_STAFF
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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