fix(audit léger): stats carrière, présence amis, AddGenericId

- GetPlayerStatisticsRequestsClient: renvoyait vide -> renvoie les stats demandées
  (0 pour l'instant, raid client-hosted non traçable) pour que l'écran carrière s'affiche.
- UpdatePlayerPresenceState: persiste {inMatch,lastSeenUtc}; GetFriendList lit la présence
  et calcule onlineState (online si vu <3min, 2=en raid) au lieu de 0 en dur.
- AddGenericId: persiste l'id de service lié (était un no-op).
(Free-loadout non touché: S3 only, pas de free-loadout en S2.)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Prospect.Server.Api/Services/CloudScript/Functions/GetPlayerStatisticsRequestsClient.cs

@@ -8,13 +8,8 @@ public class GetPlayerStatisticsRequestsClientRequest
     public string[] Statistics { get; set; }
 }
 
-public class GetPlayerStatisticsRequestsClientResponse
-{
-    // TODO: Unknown structure
-}
-
 [CloudScriptFunction("GetPlayerStatisticsRequestsClient")]
-public class GetPlayerStatisticsRequestsClientFunction : ICloudScriptFunction<GetPlayerStatisticsRequestsClientRequest, GetPlayerStatisticsRequestsClientResponse>
+public class GetPlayerStatisticsRequestsClientFunction : ICloudScriptFunction<GetPlayerStatisticsRequestsClientRequest, object>
 {
     private readonly IHttpContextAccessor _httpContextAccessor;
 
@@ -23,7 +18,7 @@ public class GetPlayerStatisticsRequestsClientFunction : ICloudScriptFunction<Ge
         _httpContextAccessor = httpContextAccessor;
     }
 
-    public async Task<GetPlayerStatisticsRequestsClientResponse> ExecuteAsync(GetPlayerStatisticsRequestsClientRequest request)
+    public Task<object> ExecuteAsync(GetPlayerStatisticsRequestsClientRequest request)
     {
         var context = _httpContextAccessor.HttpContext;
         if (context == null)
@@ -31,8 +26,15 @@ public class GetPlayerStatisticsRequestsClientFunction : ICloudScriptFunction<Ge
             throw new CloudScriptException("CloudScript was not called within a http request");
         }
 
-        return new GetPlayerStatisticsRequestsClientResponse
+        // Return each requested statistic with a value so the career screen renders instead
+        // of staying blank. Raid stats (kills/deaths/evacs/damage/…) come from the
+        // client-hosted raid and aren't tracked server-side, so they report 0 for now.
+        var stats = new List<object>();
+        foreach (var name in request.Statistics ?? Array.Empty<string>())
         {
-        };
+            stats.Add(new { statisticName = name, value = 0 });
+        }
+
+        return Task.FromResult<object>(new { statistics = stats });
     }
 }