refactor finance.

API/ROLAC.API/DTOs/Finance/FinanceDashboardDtos.cs

@@ -0,0 +1,25 @@
+namespace ROLAC.API.DTOs.Finance;
+
+/// <summary>All-time finance position for the dashboard balance card.</summary>
+public class FinanceSummaryDto
+{
+    public decimal TotalIncome   { get; set; }  // all-time sum of Giving.Amount
+    public decimal TotalExpenses { get; set; }  // all-time Paid+Approved expenses
+    public decimal Balance       { get; set; }  // TotalIncome - TotalExpenses
+}
+
+/// <summary>Income vs expense totals for a date range (the income/expense pie).</summary>
+public class IncomeExpenseDto
+{
+    public decimal Income  { get; set; }  // Givings in [from,to]
+    public decimal Expense { get; set; }  // Paid+Approved expenses in [from,to]
+}
+
+/// <summary>One slice of the expense drill-down pie. Id is a ministry / group / sub-category id by level.</summary>
+public class BreakdownSliceDto
+{
+    public int     Id      { get; set; }
+    public string  Name_en { get; set; } = "";
+    public string? Name_zh { get; set; }
+    public decimal Amount  { get; set; }
+}