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/GetFriendList.cs

@@ -47,9 +47,28 @@ public class GetFriendList : ICloudScriptFunction<FYBaseSocialRequest, object?>
         if (steamIds.Count > 0)
         {
             var players = await _userService.FindManyAsync(PlayFabUserAuthType.Steam, steamIds);
+            var nowUtc = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
             foreach (var player in players)
             {
                 if (player.Id == userId) continue; // never list yourself
+
+                // Presence persisted by UpdatePlayerPresenceState: online if seen in the last
+                // 3 minutes. EYUserState best-effort: 0 = offline, 1 = online, 2 = in match.
+                var onlineState = 0;
+                var presenceData = await _userDataService.FindAsync(player.Id, player.Id, new List<string> { "PresenceState" });
+                if (presenceData.TryGetValue("PresenceState", out var presenceRec) && !string.IsNullOrWhiteSpace(presenceRec.Value))
+                {
+                    try
+                    {
+                        var presence = JsonSerializer.Deserialize<PlayerPresenceState>(presenceRec.Value);
+                        if (presence != null && nowUtc - presence.LastSeenUtc <= 180)
+                        {
+                            onlineState = presence.InMatch ? 2 : 1;
+                        }
+                    }
+                    catch { /* ignore malformed presence */ }
+                }
+
                 friends.Add(new
                 {
                     profile = new
@@ -58,7 +77,7 @@ public class GetFriendList : ICloudScriptFunction<FYBaseSocialRequest, object?>
                         displayName = player.DisplayName,
                         avatarUrl = "",
                     },
-                    onlineState = 0, // EYUserState — real presence tracking is a later phase
+                    onlineState,
                 });
             }
         }