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>

src/tdlib/mod.rs

@@ -2,17 +2,21 @@
 pub mod auth;
 pub mod chats;
 pub mod client;
+mod client_impl; // Private module for trait implementation
 pub mod messages;
 pub mod reactions;
+pub mod r#trait;
 pub mod types;
 pub mod users;
 
 // Экспорт основных типов
 pub use auth::AuthState;
 pub use client::TdClient;
+pub use r#trait::TdClientTrait;
 pub use types::{
-    ChatInfo, MessageBuilder, MessageInfo, NetworkState, ProfileInfo, ReplyInfo, UserOnlineStatus,
+    ChatInfo, FolderInfo, MessageBuilder, MessageInfo, NetworkState, ProfileInfo, ReplyInfo, UserOnlineStatus,
 };
+pub use users::UserCache;
 
 // Re-export ChatAction для удобства
 pub use tdlib_rs::enums::ChatAction;