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UI-U3: server-side min-winrate/min-copyability filters

Add optional minWinRate/minCopyability params to GetTradersAsync so the
leaderboard min-value filters see the full pool instead of being applied
client-side to only the first page of results. Covered by a new
AnalyticsService test (three traders, both filters).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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src/Predictalytics.Application.Tests/Services/AnalyticsServiceTests.cs

@@ -101,6 +101,51 @@ public class AnalyticsServiceTests
         Assert.Equal(87.5m, deepDive.EntryQuality);
     }
 
+    [Fact]
+    public async Task GetTradersAsync_MinFilters_ExcludeBelowThreshold()
+    {
+        // Arrange
+        using var db = CreateDbContext();
+        var traderRepo = new TraderRepository(db);
+        var tradeRepo = new TradeRepository(db, NullLogger<TradeRepository>.Instance);
+        var discoveryMock = new Mock<IDiscoveryService>();
+        var pnlEngineMock = new Mock<IPositionPnLEngine>();
+        var alertRepoMock = new Mock<IAlertRepository>();
+        var watchlistRepoMock = new Mock<IWatchlistRepository>();
+        watchlistRepoMock.Setup(w => w.GetAllAsync(It.IsAny<CancellationToken>()))
+            .ReturnsAsync(new List<WatchlistEntry>());
+        var marketRepo = new MarketRepository(db);
+        var providers = new List<IPlatformProvider>();
+
+        var svc = new AnalyticsService(
+            traderRepo, tradeRepo, alertRepoMock.Object, watchlistRepoMock.Object,
+            marketRepo, discoveryMock.Object, providers, pnlEngineMock.Object,
+            NullLogger<AnalyticsService>.Instance);
+
+        // Three traders: WinRate 40 / 60 / 80, Copyability 30 / 55 / 90.
+        db.Traders.Add(new Trader { Id = 1, PlatformUserId = "0xA", DisplayName = "Low", WinRate = 40m,
+            Analytics = new TraderAnalytics { TraderId = 1, CopytradingCopyabilityScore = 30m } });
+        db.Traders.Add(new Trader { Id = 2, PlatformUserId = "0xB", DisplayName = "Mid", WinRate = 60m,
+            Analytics = new TraderAnalytics { TraderId = 2, CopytradingCopyabilityScore = 55m } });
+        db.Traders.Add(new Trader { Id = 3, PlatformUserId = "0xC", DisplayName = "High", WinRate = 80m,
+            Analytics = new TraderAnalytics { TraderId = 3, CopytradingCopyabilityScore = 90m } });
+        await db.SaveChangesAsync();
+
+        // Act — minWinRate 55 keeps Mid + High.
+        var byWinRate = await svc.GetTradersAsync(minWinRate: 55m);
+        // minCopyability 60 keeps only High.
+        var byCopyability = await svc.GetTradersAsync(minCopyability: 60m);
+        // No filter keeps all three.
+        var unfiltered = await svc.GetTradersAsync();
+
+        // Assert
+        Assert.Equal(2, byWinRate.Count);
+        Assert.DoesNotContain(byWinRate, t => t.DisplayName == "Low");
+        Assert.Single(byCopyability);
+        Assert.Equal("High", byCopyability[0].DisplayName);
+        Assert.Equal(3, unfiltered.Count);
+    }
+
     private class MockDiscoveryService : IDiscoveryService
     {
         public Task<int> ImportTraderAsync(PlatformType platform, string platformUserId, string displayName, bool isAutoDiscovered = true, CancellationToken ct = default)