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/ui/main_screen.rs

@@ -1,5 +1,6 @@
 use super::{chat_list, footer, messages};
 use crate::app::App;
+use crate::tdlib::TdClientTrait;
 use ratatui::{
     layout::{Constraint, Direction, Layout, Rect},
     style::{Color, Modifier, Style},
@@ -11,7 +12,7 @@ use ratatui::{
 /// Порог ширины для компактного режима (одна панель)
 const COMPACT_WIDTH: u16 = 80;
 
-pub fn render(f: &mut Frame, app: &mut App) {
+pub fn render<T: TdClientTrait>(f: &mut Frame, app: &mut App<T>) {
     let area = f.area();
     let is_compact = area.width < COMPACT_WIDTH;
 
@@ -52,7 +53,7 @@ pub fn render(f: &mut Frame, app: &mut App) {
     footer::render(f, chunks[2], app);
 }
 
-fn render_folders(f: &mut Frame, area: Rect, app: &App) {
+fn render_folders<T: TdClientTrait>(f: &mut Frame, area: Rect, app: &App<T>) {
     let mut spans = vec![];
 
     // "All" всегда первая (клавиша 1)