refactor: create timeout/retry utilities to reduce code duplication (P1.1)

Created new utility modules to eliminate repeated timeout/retry patterns:
- src/utils/retry.rs: with_timeout() and with_timeout_msg() helpers
- src/utils/formatting.rs: timestamp formatting utilities (from utils.rs)
- src/utils/tdlib.rs: TDLib log configuration utilities (from utils.rs)

Refactored src/input/main_input.rs:
- Replaced 18+ instances of timeout(Duration, op).await pattern
- Simplified error handling from nested Ok(Ok(...))/Ok(Err(...))/Err(...)
  to cleaner Ok(...)/Err(...) with custom timeout messages
- Added type annotations for compiler type inference

Benefits:
- Reduced code duplication from ~20 instances to 2 utility functions
- Cleaner, more readable error handling
- Easier to maintain timeout logic in one place
- All 59 tests passing

Progress: REFACTORING_OPPORTUNITIES.md #1 (Дублирование кода) - Частично выполнено

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

src/utils/tdlib.rs

@@ -0,0 +1,23 @@
+use std::ffi::CString;
+use std::os::raw::c_char;
+
+#[link(name = "tdjson")]
+extern "C" {
+    fn td_execute(request: *const c_char) -> *const c_char;
+}
+
+/// Отключаем логи TDLib синхронно, до создания клиента
+pub fn disable_tdlib_logs() {
+    let request = r#"{"@type":"setLogVerbosityLevel","new_verbosity_level":0}"#;
+    let c_request = CString::new(request).unwrap();
+    unsafe {
+        let _ = td_execute(c_request.as_ptr());
+    }
+
+    // Также перенаправляем логи в никуда
+    let request2 = r#"{"@type":"setLogStream","log_stream":{"@type":"logStreamEmpty"}}"#;
+    let c_request2 = CString::new(request2).unwrap();
+    unsafe {
+        let _ = td_execute(c_request2.as_ptr());
+    }
+}