Sync phone contacts and enable chat deletion

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

@@ -11,6 +11,18 @@ public interface IMaxBridgeClient
     {
         return Task.FromResult<IReadOnlyList<MaxContact>>(Array.Empty<MaxContact>());
     }
+    Task<IReadOnlyList<MaxContact>> ImportContactsAsync(IReadOnlyList<MaxPhoneContact> contacts, CancellationToken cancellationToken)
+    {
+        return Task.FromResult<IReadOnlyList<MaxContact>>(Array.Empty<MaxContact>());
+    }
+    Task<MaxContact?> AddContactAsync(string userId, CancellationToken cancellationToken)
+    {
+        return Task.FromResult<MaxContact?>(null);
+    }
+    Task<MaxActionResult> RemoveContactAsync(string userId, CancellationToken cancellationToken)
+    {
+        return Task.FromResult(new MaxActionResult(false, "Contact removal is not supported."));
+    }
     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

@@ -80,4 +80,7 @@ public sealed record MaxContact(
     string DisplayName,
     string? AvatarUrl,
     string? PhoneNumber,
-    string? Status);
+    string? Status,
+    bool IsSavedContact = false);
+
+public sealed record MaxPhoneContact(string PhoneNumber, string FirstName, string? LastName);

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

@@ -48,10 +48,25 @@ public sealed class MockMaxBridgeClient : IMaxBridgeClient
     public Task<IReadOnlyList<MaxContact>> FetchContactsAsync(CancellationToken cancellationToken)
     {
         return Task.FromResult<IReadOnlyList<MaxContact>>([
-            new MaxContact("mock-user", "mock-direct", "Mock contact", null, "+70000000000", "online")
+            new MaxContact("mock-user", "mock-direct", "Mock contact", null, "+70000000000", "online", true)
         ]);
     }
 
+    public Task<IReadOnlyList<MaxContact>> ImportContactsAsync(IReadOnlyList<MaxPhoneContact> contacts, CancellationToken cancellationToken)
+    {
+        return FetchContactsAsync(cancellationToken);
+    }
+
+    public async Task<MaxContact?> AddContactAsync(string userId, CancellationToken cancellationToken)
+    {
+        return (await FetchContactsAsync(cancellationToken)).FirstOrDefault();
+    }
+
+    public Task<MaxActionResult> RemoveContactAsync(string userId, CancellationToken cancellationToken)
+    {
+        return Task.FromResult(new MaxActionResult(true, null));
+    }
+
     public Task<MaxChatUpdate?> FetchChatHistoryAsync(string externalChatId, string? chatUrl, CancellationToken cancellationToken)
     {
         var update = _updates.FirstOrDefault(x => x.ExternalId == externalChatId);
@@ -75,9 +90,7 @@ public sealed class MockMaxBridgeClient : IMaxBridgeClient
 
     public Task<MaxActionResult> DeleteChatAsync(string externalChatId, string? chatUrl, CancellationToken cancellationToken)
     {
-        return Task.FromResult(new MaxActionResult(
-            false,
-            "Chat deletion is disabled because MAX does not remove chats from the web client."));
+        return Task.FromResult(new MaxActionResult(true, null));
     }
 
     public Task<MaxSendResult> SendTextAsync(string externalChatId, string? chatUrl, string text, CancellationToken cancellationToken)

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

@@ -49,6 +49,29 @@ public sealed class WorkerMaxBridgeClient(
             ?? Array.Empty<MaxContact>();
     }
 
+    public async Task<IReadOnlyList<MaxContact>> ImportContactsAsync(
+        IReadOnlyList<MaxPhoneContact> contacts,
+        CancellationToken cancellationToken)
+    {
+        return await SendAsync<IReadOnlyList<MaxContact>>(
+                HttpMethod.Post,
+                "/contacts/import",
+                new { contacts },
+                cancellationToken)
+            ?? Array.Empty<MaxContact>();
+    }
+
+    public async Task<MaxContact?> AddContactAsync(string userId, CancellationToken cancellationToken)
+    {
+        return await SendAsync<MaxContact>(HttpMethod.Post, "/contacts/add", new { userId }, cancellationToken);
+    }
+
+    public async Task<MaxActionResult> RemoveContactAsync(string userId, CancellationToken cancellationToken)
+    {
+        return await SendAsync<MaxActionResult>(HttpMethod.Post, "/contacts/remove", new { userId }, cancellationToken)
+            ?? new MaxActionResult(false, "Worker returned an empty contact removal result.");
+    }
+
     public async Task<MaxChatUpdate?> FetchChatHistoryAsync(string externalChatId, string? chatUrl, CancellationToken cancellationToken)
     {
         return await SendAsync<MaxChatUpdate>(HttpMethod.Post, "/chat/history", new { externalChatId, chatUrl }, cancellationToken);
@@ -75,11 +98,14 @@ public sealed class WorkerMaxBridgeClient(
             ?? new MaxActionResult(false, "Worker returned an empty clear history result.");
     }
 
-    public Task<MaxActionResult> DeleteChatAsync(string externalChatId, string? chatUrl, CancellationToken cancellationToken)
+    public async Task<MaxActionResult> DeleteChatAsync(string externalChatId, string? chatUrl, CancellationToken cancellationToken)
     {
-        return Task.FromResult(new MaxActionResult(
-            false,
-            "Chat deletion is disabled because MAX does not remove chats from the web client."));
+        return await SendAsync<MaxActionResult>(
+                HttpMethod.Post,
+                "/chat/delete",
+                new { externalChatId, chatUrl },
+                cancellationToken)
+            ?? new MaxActionResult(false, "Worker returned an empty chat deletion result.");
     }
 
     public async Task<MaxSendResult> SendTextAsync(string externalChatId, string? chatUrl, string text, CancellationToken cancellationToken)