refactor: implement trait-based DI for TdClient and fix stack overflow

Implement complete trait-based dependency injection pattern for TdClient
to enable testing with FakeTdClient mock. Fix critical stack overflow bugs
caused by infinite recursion in trait implementations.

Breaking Changes:
- App is now generic: App<T: TdClientTrait = TdClient>
- All UI and input handlers are generic over TdClientTrait
- TdClient methods now accessed through trait interface

New Files:
- src/tdlib/trait.rs: TdClientTrait definition with 40+ methods
- src/tdlib/client_impl.rs: TdClientTrait impl for TdClient
- tests/helpers/fake_tdclient_impl.rs: TdClientTrait impl for FakeTdClient

Critical Fixes:
- Fix stack overflow in send_message, edit_message, delete_messages
- Fix stack overflow in forward_messages, current_chat_messages
- Fix stack overflow in current_pinned_message
- All methods now call message_manager directly to avoid recursion

Testing:
- FakeTdClient supports configurable auth_state for auth screen tests
- Added pinned message support in FakeTdClient
- All 196+ tests passing (188 tests + 8 benchmarks)

Dependencies:
- Added async-trait = "0.1"

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tests/input_navigation.rs

@@ -261,18 +261,17 @@ async fn test_insert_char_at_cursor_position() {
 /// Test: Навигация вверх по сообщениям из пустого инпута
 #[tokio::test]
 async fn test_up_arrow_selects_last_message_when_input_empty() {
-    let mut app = TestAppBuilder::new()
-        .with_chats(vec![create_test_chat("Chat 1", 101)])
-        .selected_chat(101)
-        .build();
-
-    // Добавляем сообщения
     let messages = vec![
         TestMessageBuilder::new("Msg 1", 1).outgoing().build(),
         TestMessageBuilder::new("Msg 2", 2).outgoing().build(),
         TestMessageBuilder::new("Msg 3", 3).outgoing().build(),
     ];
-    app.td_client.message_manager.current_chat_messages = messages;
+    
+    let mut app = TestAppBuilder::new()
+        .with_chats(vec![create_test_chat("Chat 1", 101)])
+        .selected_chat(101)
+        .with_messages(101, messages)
+        .build();
 
     // Инпут пустой
     assert_eq!(app.message_input, "");