refactor(mcp): rewrite all tools to use MoneyMapApiClient instead of direct DB access

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

MoneyMap.Mcp/Tools/DashboardTools.cs

@@ -1,68 +1,26 @@
 using System.ComponentModel;
-using System.Text.Json;
-using Microsoft.EntityFrameworkCore;
 using ModelContextProtocol.Server;
-using MoneyMap.Data;
-using MoneyMap.Services;
 
 namespace MoneyMap.Mcp.Tools;
 
 [McpServerToolType]
 public static class DashboardTools
 {
-    private static readonly JsonSerializerOptions JsonOptions = new() { WriteIndented = true };
-
     [McpServerTool(Name = "get_dashboard"), Description("Get dashboard overview: top spending categories, recent transactions, and aggregate stats.")]
     public static async Task<string> GetDashboard(
         [Description("Number of top categories to show (default 8)")] int? topCategoriesCount = null,
         [Description("Number of recent transactions to show (default 20)")] int? recentTransactionsCount = null,
-        IDashboardService dashboardService = default!)
+        MoneyMapApiClient api = default!)
     {
-        var data = await dashboardService.GetDashboardDataAsync(
-            topCategoriesCount ?? 8,
-            recentTransactionsCount ?? 20);
-
-        return JsonSerializer.Serialize(data, JsonOptions);
+        return await api.GetDashboardAsync(topCategoriesCount, recentTransactionsCount);
     }
 
     [McpServerTool(Name = "get_monthly_trend"), Description("Get month-over-month spending totals for trend analysis.")]
     public static async Task<string> GetMonthlyTrend(
         [Description("Number of months to include (default 6)")] int? months = null,
         [Description("Filter to a specific category")] string? category = null,
-        MoneyMapContext db = default!)
+        MoneyMapApiClient api = default!)
     {
-        var monthCount = months ?? 6;
-        var endDate = DateTime.Today;
-        var startDate = new DateTime(endDate.Year, endDate.Month, 1).AddMonths(-(monthCount - 1));
-
-        var q = db.Transactions
-            .Where(t => t.Date >= startDate && t.Date <= endDate)
-            .Where(t => t.Amount < 0)
-            .Where(t => t.TransferToAccountId == null)
-            .ExcludeTransfers();
-
-        if (!string.IsNullOrWhiteSpace(category))
-            q = q.Where(t => t.Category == category);
-
-        var monthly = await q
-            .GroupBy(t => new { t.Date.Year, t.Date.Month })
-            .Select(g => new
-            {
-                Year = g.Key.Year,
-                Month = g.Key.Month,
-                Total = g.Sum(t => Math.Abs(t.Amount)),
-                Count = g.Count()
-            })
-            .OrderBy(x => x.Year).ThenBy(x => x.Month)
-            .ToListAsync();
-
-        var result = monthly.Select(m => new
-        {
-            Period = $"{m.Year}-{m.Month:D2}",
-            m.Total,
-            m.Count
-        }).ToList();
-
-        return JsonSerializer.Serialize(new { Category = category ?? "All Spending", Months = result }, JsonOptions);
+        return await api.GetMonthlyTrendAsync(months, category);
     }
 }