feat: 添加获取未被预算覆盖的分类统计信息接口；更新前端以展示未覆盖分类的详细信息

Service/BudgetService.cs

@@ -12,6 +12,11 @@ public interface IBudgetService
     /// 获取指定分类的统计信息（月度和年度）
     /// </summary>
     Task<BudgetCategoryStats> GetCategoryStatsAsync(BudgetCategory category, DateTime? referenceDate = null);
+
+    /// <summary>
+    /// 获取未被预算覆盖的分类统计信息
+    /// </summary>
+    Task<List<UncoveredCategoryDetail>> GetUncoveredCategoriesAsync(BudgetCategory category, DateTime? referenceDate = null);
 }
 
 public class BudgetService(
@@ -146,6 +151,41 @@ public class BudgetService(
         return result;
     }
 
+    public async Task<List<UncoveredCategoryDetail>> GetUncoveredCategoriesAsync(BudgetCategory category, DateTime? referenceDate = null)
+    {
+        var date = referenceDate ?? DateTime.Now;
+        var transactionType = category switch
+        {
+            BudgetCategory.Expense => TransactionType.Expense,
+            BudgetCategory.Income => TransactionType.Income,
+            _ => TransactionType.None
+        };
+
+        if (transactionType == TransactionType.None) return new List<UncoveredCategoryDetail>();
+
+        // 1. 获取所有预算
+        var budgets = (await budgetRepository.GetAllAsync()).ToList();
+        var coveredCategories = budgets
+            .Where(b => b.Category == category)
+            .SelectMany(b => b.SelectedCategories.Split(',', StringSplitOptions.RemoveEmptyEntries))
+            .ToHashSet();
+
+        // 2. 获取分类统计
+        var stats = await transactionRecordRepository.GetCategoryStatisticsAsync(date.Year, date.Month, transactionType);
+
+        // 3. 过滤未覆盖的
+        return stats
+            .Where(s => !coveredCategories.Contains(s.Classify))
+            .Select(s => new UncoveredCategoryDetail
+            {
+                Category = s.Classify,
+                TransactionCount = s.Count,
+                TotalAmount = s.Amount
+            })
+            .OrderByDescending(x => x.TotalAmount)
+            .ToList();
+    }
+
     private async Task<BudgetStatsDto> CalculateCategoryStatsAsync(
         List<BudgetRecord> budgets,
         BudgetCategory category,
@@ -673,4 +713,10 @@ public class BudgetCategoryStats
     /// 年度统计
     /// </summary>
     public BudgetStatsDto Year { get; set; } = new();
-}
+}
+public class UncoveredCategoryDetail
+{
+    public string Category { get; set; } = string.Empty;
+    public int TransactionCount { get; set; }
+    public decimal TotalAmount { get; set; }
+}