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/UpdatePlayerPresenceState.cs

@@ -1,12 +1,51 @@
-using Prospect.Server.Api.Services.CloudScript.Models;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Prospect.Server.Api.Services.Auth.Extensions;
+using Prospect.Server.Api.Services.CloudScript.Models;
+using Prospect.Server.Api.Services.UserData;
 
 namespace Prospect.Server.Api.Services.CloudScript.Functions;
 
+// Persisted presence, read back by GetFriendList to show friends' online / in-match state.
+public class PlayerPresenceState
+{
+    [JsonPropertyName("inMatch")]
+    public bool InMatch { get; set; }
+    [JsonPropertyName("lastSeenUtc")]
+    public long LastSeenUtc { get; set; }
+}
+
 [CloudScriptFunction("UpdatePlayerPresenceState")]
 public class UpdatePlayerPresenceState : ICloudScriptFunction<FYUpdatePlayerPresenceStateRequest, object>
 {
-    public Task<object> ExecuteAsync(FYUpdatePlayerPresenceStateRequest request)
+    private readonly IHttpContextAccessor _httpContextAccessor;
+    private readonly UserDataService _userDataService;
+
+    public UpdatePlayerPresenceState(IHttpContextAccessor httpContextAccessor, UserDataService userDataService)
     {
-        return Task.FromResult<object>(new { });
+        _httpContextAccessor = httpContextAccessor;
+        _userDataService = userDataService;
     }
-}
+
+    public async Task<object> ExecuteAsync(FYUpdatePlayerPresenceStateRequest request)
+    {
+        var context = _httpContextAccessor.HttpContext;
+        if (context == null)
+        {
+            return new { };
+        }
+
+        var userId = context.User.FindAuthUserId();
+        var state = new PlayerPresenceState
+        {
+            InMatch = request.InMatch,
+            LastSeenUtc = DateTimeOffset.UtcNow.ToUnixTimeSeconds(),
+        };
+        await _userDataService.UpdateAsync(
+            userId, userId,
+            new Dictionary<string, string> { ["PresenceState"] = JsonSerializer.Serialize(state) }
+        );
+
+        return new { };
+    }
+}