feat: Add category performance, update WebUI and OpenRouter integration, fix bugs

src/Predictalytics.Api/Endpoints/TraderEndpoints.cs

@@ -1,4 +1,5 @@
 using Predictalytics.Application.Interfaces;
+using Predictalytics.Application.Services;
 
 namespace Predictalytics.Api.Endpoints;
 
@@ -35,6 +36,18 @@ public static class TraderEndpoints
             return Results.Ok();
         });
 
+        group.MapPost("/{id:int}/watchlist", async (int id, WatchlistService svc, CancellationToken ct) =>
+        {
+            await svc.AddAsync(id, "Watched via UI", null, ct);
+            return Results.Ok();
+        });
+
+        group.MapDelete("/{id:int}/watchlist", async (int id, WatchlistService svc, CancellationToken ct) =>
+        {
+            await svc.RemoveByTraderIdAsync(id, ct);
+            return Results.Ok();
+        });
+
         group.MapPost("/{id:int}/ai-analysis", async (int id, bool manual, IAiStrategyAnalysisService aiSvc, CancellationToken ct) =>
         {
             var summary = await aiSvc.AnalyzeTraderStrategyAsync(id, manual, ct);