feat(logger): add extensible logging API, usage examples, and bilingual documentation

- Introduce CherryPickLogger interface, PrintLogger and SilentLogger implementations
- Add setGlobalLogger() to CherryPick API for custom DI logging
- Log key events (scope, module, error) via logger throughout DI lifecycle
- Comprehensive comments and code documentation in both English and Russian
- Document usage of logging system in quick_start and full_tutorial documentation (EN/RU)
- Provide usage examples in docs and code comments
- No logging inside GlobalCycleDetectionMixin (design choice: exceptions handled at Scope, not detector/mixin level) and detailed architectural reasoning
- Update helper.dart, logger.dart: comments, examples, API doc improvements
BREAKING CHANGE: Projects can now inject any logger via CherryPick.setGlobalLogger; default log behavior clarified and docstrings/usage examples enhanced

doc/full_tutorial_en.md

@@ -313,7 +313,7 @@ final config = await scope.resolveAsync<RemoteConfig>();
 
 [`cherrypick_flutter`](https://pub.dev/packages/cherrypick_flutter) is the integration package for CherryPick DI in Flutter. It provides a convenient `CherryPickProvider` widget which sits in your widget tree and gives access to the root DI scope (and subscopes) from context.
 
-### Features
+## Features
 
 - **Global DI Scope Access:**  
   Use `CherryPickProvider` to access rootScope and subscopes anywhere in the widget tree.
@@ -356,6 +356,26 @@ class MyApp extends StatelessWidget {
 - You can create subscopes, e.g. for screens or modules:  
   `final subScope = CherryPickProvider.of(context).openSubScope(scopeName: "profileFeature");`
 
+---
+
+## Logging
+
+To enable logging of all dependency injection (DI) events and errors in CherryPick, set the global logger before creating your scopes:
+
+```dart
+import 'package:cherrypick/cherrypick.dart';
+
+void main() {
+  // Set a global logger before any scopes are created
+  CherryPick.setGlobalLogger(PrintLogger()); // or your own custom logger
+  final scope = CherryPick.openRootScope();
+  // All DI events and cycle errors will now be sent to your logger
+}
+```
+
+- By default, CherryPick uses SilentLogger (no output in production).
+- Any dependency resolution, scope events, or cycle detection errors are logged via info/error on your logger.
+
 ---
 ## CherryPick is not just for Flutter!
 

doc/full_tutorial_ru.md

@@ -358,6 +358,26 @@ class MyApp extends StatelessWidget {
 - Вы можете создавать подскоупы, если нужно, например, для экранов или модулей:  
   `final subScope = CherryPickProvider.of(context).openSubScope(scopeName: "profileFeature");`
 
+---
+
+## Логирование
+
+Чтобы включить вывод логов о событиях и ошибках DI в CherryPick, настройте глобальный логгер до создания любых scope:
+
+```dart
+import 'package:cherrypick/cherrypick.dart';
+
+void main() {
+  // Установите глобальный логгер до создания scope
+  CherryPick.setGlobalLogger(PrintLogger()); // или свой логгер
+  final scope = CherryPick.openRootScope();
+  // Логи DI и циклов будут выводиться через ваш логгер
+}
+```
+
+- По умолчанию используется SilentLogger (нет логов в продакшене).
+- Любые ошибки резолва и события циклов логируются через info/error на логгере.
+
 ---
 ## CherryPick подходит не только для Flutter!
 

doc/quick_start_en.md

@@ -79,6 +79,24 @@ Example:
     Cherrypick.closeRootScope();
 ```
 
+## Logging
+
+To enable logging of all dependency injection (DI) events and errors in CherryPick, set the global logger before creating your scopes:
+
+```dart
+import 'package:cherrypick/cherrypick.dart';
+
+void main() {
+  // Set a global logger before any scopes are created
+  CherryPick.setGlobalLogger(PrintLogger()); // or your own custom logger
+  final scope = CherryPick.openRootScope();
+  // All DI events and cycle errors will now be sent to your logger
+}
+```
+
+- By default, CherryPick uses SilentLogger (no output in production).
+- Any dependency resolution, scope events, or cycle detection errors are logged via info/error on your logger.
+
 ## Example app
 
 

doc/quick_start_ru.md

@@ -79,6 +79,24 @@ Scope - это контейнер, который хранит все дерев
     Cherrypick.closeRootScope();
 ```
 
+## Логирование
+
+Чтобы включить вывод логов о событиях и ошибках DI в CherryPick, настройте глобальный логгер до создания любых scope:
+
+```dart
+import 'package:cherrypick/cherrypick.dart';
+
+void main() {
+  // Установите глобальный логгер до создания scope
+  CherryPick.setGlobalLogger(PrintLogger()); // или свой логгер
+  final scope = CherryPick.openRootScope();
+  // Логи DI и циклов будут выводиться через ваш логгер
+}
+```
+
+- По умолчанию используется SilentLogger (нет логов в продакшене).
+- Любые ошибки резолва и события циклов логируются через info/error на логгере.
+
 ## Пример приложения