feat(proj): init

mobile/lib/data/repositories/repositories.dart

@@ -0,0 +1,80 @@
+import 'package:please_pay_me/data/models/auth_user.dart';
+import 'package:please_pay_me/data/models/budget.dart';
+import 'package:please_pay_me/data/models/expense.dart';
+import 'package:please_pay_me/data/models/job.dart';
+
+/// Contracts the UI depends on. Implemented by the REST backend and by the
+/// in-memory demo backend used for previews and tests.
+abstract interface class BudgetRepository {
+  Future<List<BudgetStatus>> list();
+
+  Future<BudgetStatus> status({int? budgetId});
+
+  Future<BudgetStatus> create({
+    required String name,
+    required double totalAmount,
+    required DateTime endDate,
+    DateTime? startDate,
+  });
+
+  Future<BudgetStatus> update({
+    required int budgetId,
+    String? name,
+    double? totalAmount,
+    DateTime? endDate,
+    DateTime? startDate,
+    bool resetExpenses = false,
+  });
+
+  Future<BudgetStatus> select(int budgetId);
+
+  Future<BudgetStatus> setActive(int budgetId, {required bool isActive});
+
+  Future<void> delete(int budgetId);
+}
+
+abstract interface class ExpenseRepository {
+  Future<ExpensesPage> page({
+    required int page,
+    int pageSize = 20,
+    int? budgetId,
+    bool all = false,
+  });
+
+  Future<BudgetStatus> create({
+    required double amount,
+    String? note,
+    DateTime? spentAt,
+    int? budgetId,
+  });
+
+  Future<double> undoLast({int? budgetId});
+}
+
+abstract interface class JobRepository {
+  Future<List<Job>> list();
+
+  Future<Job> create({
+    required String name,
+    required double salaryAmount,
+    required List<int> payDays,
+    required double firstPayPercent,
+    required WeekendPolicy weekendPolicy,
+  });
+
+  Future<Job> update({
+    required int jobId,
+    required String name,
+    required double salaryAmount,
+    required List<int> payDays,
+    required double firstPayPercent,
+    required WeekendPolicy weekendPolicy,
+    bool isActive = true,
+  });
+
+  Future<void> delete(int jobId);
+}
+
+abstract interface class UserRepository {
+  Future<AuthUser> me();
+}