Phase E: Add Bank Reconciliation

- IsCleared + ClearedDate added to Payment, BillPayment, Expense entities
- BankReconciliation entity (account, statement date, beginning/ending balance, status)
- BankReconciliationStatus enum (InProgress, Completed)
- Migration AddBankReconciliation: new BankReconciliations table + IsCleared/ClearedDate columns
- IUnitOfWork/UnitOfWork wired with BankReconciliations repo
- BankReconciliationsController: Index, Create, Reconcile, ToggleCleared (AJAX), Complete, Report
- Reconcile view: deposit/payment checkboxes with live running balance and difference via JS
- Complete is gated: only enabled when difference == $0.00
- Nav: Bank Reconciliation added to Finance section in _Layout

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Core/Interfaces/IUnitOfWork.cs

@@ -100,6 +100,9 @@ public interface IUnitOfWork : IDisposable
     IRepository<VendorCreditLineItem> VendorCreditLineItems { get; }
     IRepository<VendorCreditApplication> VendorCreditApplications { get; }
 
+    // Bank Reconciliation
+    IRepository<BankReconciliation> BankReconciliations { get; }
+
     // Notifications — typed repository for IgnoreQueryFilters-based history lookups
     INotificationLogRepository NotificationLogs { get; }
     IRepository<NotificationTemplate> NotificationTemplates { get; }