Add MAX contacts and direct chat creation

server/QMax.Api/Infrastructure/Max/IMaxBridgeClient.cs

@@ -7,6 +7,10 @@ public interface IMaxBridgeClient
     Task<MaxBridgeStatus> SubmitLoginCodeAsync(string code, CancellationToken cancellationToken);
     Task<MaxBrowserSnapshot> GetSnapshotAsync(CancellationToken cancellationToken);
     Task<IReadOnlyList<MaxChatUpdate>> FetchUpdatesAsync(CancellationToken cancellationToken);
+    Task<IReadOnlyList<MaxContact>> FetchContactsAsync(CancellationToken cancellationToken)
+    {
+        return Task.FromResult<IReadOnlyList<MaxContact>>(Array.Empty<MaxContact>());
+    }
     Task<MaxChatUpdate?> FetchChatHistoryAsync(string externalChatId, string? chatUrl, CancellationToken cancellationToken);
     Task<MaxChatPresence?> FetchChatPresenceAsync(string externalChatId, string? chatUrl, CancellationToken cancellationToken);
     Task<MaxChatUrlResult> ResolveChatUrlAsync(string externalChatId, CancellationToken cancellationToken);

server/QMax.Api/Infrastructure/Max/MaxBridgeModels.cs

@@ -73,3 +73,11 @@ public sealed record MaxChannelSearchResult(
     string? ChatUrl,
     bool IsSubscribed,
     string? Description = null);
+
+public sealed record MaxContact(
+    string UserId,
+    string ExternalChatId,
+    string DisplayName,
+    string? AvatarUrl,
+    string? PhoneNumber,
+    string? Status);

server/QMax.Api/Infrastructure/Max/MockMaxBridgeClient.cs

@@ -45,6 +45,13 @@ public sealed class MockMaxBridgeClient : IMaxBridgeClient
         return Task.FromResult<IReadOnlyList<MaxChatUpdate>>(_updates);
     }
 
+    public Task<IReadOnlyList<MaxContact>> FetchContactsAsync(CancellationToken cancellationToken)
+    {
+        return Task.FromResult<IReadOnlyList<MaxContact>>([
+            new MaxContact("mock-user", "mock-direct", "Mock contact", null, "+70000000000", "online")
+        ]);
+    }
+
     public Task<MaxChatUpdate?> FetchChatHistoryAsync(string externalChatId, string? chatUrl, CancellationToken cancellationToken)
     {
         var update = _updates.FirstOrDefault(x => x.ExternalId == externalChatId);

server/QMax.Api/Infrastructure/Max/WorkerMaxBridgeClient.cs

@@ -43,6 +43,12 @@ public sealed class WorkerMaxBridgeClient(
             ?? throw new InvalidOperationException("MAX worker returned an empty updates response.");
     }
 
+    public async Task<IReadOnlyList<MaxContact>> FetchContactsAsync(CancellationToken cancellationToken)
+    {
+        return await SendAsync<IReadOnlyList<MaxContact>>(HttpMethod.Get, "/contacts", null, cancellationToken)
+            ?? Array.Empty<MaxContact>();
+    }
+
     public async Task<MaxChatUpdate?> FetchChatHistoryAsync(string externalChatId, string? chatUrl, CancellationToken cancellationToken)
     {
         return await SendAsync<MaxChatUpdate>(HttpMethod.Post, "/chat/history", new { externalChatId, chatUrl }, cancellationToken);