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/Entities/Payment.cs

@@ -18,6 +18,10 @@ public class Payment : BaseEntity
     /// </summary>
     public int? DepositAccountId { get; set; }
 
+    /// <summary>True once this payment has been matched against a bank statement during reconciliation.</summary>
+    public bool IsCleared { get; set; } = false;
+    public DateTime? ClearedDate { get; set; }
+
     // Navigation
     public virtual Invoice Invoice { get; set; } = null!;
     public virtual ApplicationUser? RecordedBy { get; set; }