feat: integrate payment summary and adapter for staff earnings management

apps/mobile/packages/domain/lib/src/adapters/financial/payment_adapter.dart

@@ -0,0 +1,19 @@
+import '../../entities/financial/staff_payment.dart';
+
+/// Adapter for Payment related data.
+class PaymentAdapter {
+  
+  /// Converts string status to [PaymentStatus].
+  static PaymentStatus toPaymentStatus(String status) {
+    switch (status) {
+      case 'PAID':
+        return PaymentStatus.paid;
+      case 'PENDING':
+        return PaymentStatus.pending;
+      case 'FAILED':
+        return PaymentStatus.failed;
+      default:
+        return PaymentStatus.unknown;
+    }
+  }
+}

apps/mobile/packages/domain/lib/src/entities/financial/payment_summary.dart

@@ -0,0 +1,24 @@
+import 'package:equatable/equatable.dart';
+
+/// Summary of staff earnings.
+class PaymentSummary extends Equatable {
+  final double weeklyEarnings;
+  final double monthlyEarnings;
+  final double pendingEarnings;
+  final double totalEarnings;
+
+  const PaymentSummary({
+    required this.weeklyEarnings,
+    required this.monthlyEarnings,
+    required this.pendingEarnings,
+    required this.totalEarnings,
+  });
+
+  @override
+  List<Object?> get props => [
+        weeklyEarnings,
+        monthlyEarnings,
+        pendingEarnings,
+        totalEarnings,
+      ];
+}

apps/mobile/packages/domain/lib/src/entities/financial/staff_payment.dart

@@ -13,6 +13,9 @@ enum PaymentStatus {
 
   /// Transfer failed.
   failed,
+
+  /// Status unknown.
+  unknown,
 }
 
 /// Represents a payout to a [Staff] member for a completed [Assignment].