feat: Implement copytrading analytics and update WebUI

- Add v4 Tape-based CopytradingEstimator (Clustering, MAE, Tape Fills)
- Add CopytradingBacktestHarness (Walk-Forward testing, Shrinkage, LCB ranking)
- Add EF Core Migrations for FollowerFillPrice and Scoring fields
- Update WebUI: Fix Trader Detail tab layout blowout
- Update WebUI: Redesign Trader Detail menubar
- Update WebUI: Display separate Quality and Copyability metric cards
- Update WebUI: Add 'Highly Copyable' filter to Trader List

src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketApiClient.cs

@@ -46,9 +46,9 @@ public class PolymarketApiClient
         return await ExecuteWithRetryAsync<List<PolymarketTradeResponse>>(_client, url, "Data", ct) ?? [];
     }
 
-    public async Task<List<PolymarketTradeResponse>> GetMarketTradesAsync(string conditionId, int limit = 1000, CancellationToken ct = default)
+    public async Task<List<PolymarketTradeResponse>> GetMarketTradesAsync(string conditionId, int limit = 1000, int offset = 0, CancellationToken ct = default)
     {
-        var url = $"/trades?condition_id={conditionId}&limit={limit}";
+        var url = $"/trades?condition_id={conditionId}&limit={limit}&offset={offset}";
         return await ExecuteWithRetryAsync<List<PolymarketTradeResponse>>(_client, url, "Data", ct) ?? [];
     }
 

src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketProvider.cs

@@ -65,7 +65,7 @@ public class PolymarketProvider : IPlatformProvider
 
     public async Task<IReadOnlyList<Trade>> GetMarketTradesAsync(string platformMarketId, int limit = 1000, CancellationToken ct = default)
     {
-        var raw = await _api.GetMarketTradesAsync(platformMarketId, limit, ct);
+        var raw = await _api.GetMarketTradesAsync(platformMarketId, limit, 0, ct);
         _logger.LogInformation("Fetched {Count} trades for Market {Market} (limit={Limit})", raw.Count, platformMarketId, limit);
 
         var mappedTrades = raw.Select(r =>