docs(annotations): unify and improve English DartDoc for all DI annotations

- Updated all annotation files with complete English DartDoc, field/class/method usage, practical code samples
- Unified documentation style for @inject, @injectable, @instance, @singleton, @named, @scope, @params, @provide, @module
- Removed Russian comments for clarity and consistency
- Improved discoverability and IDE/autocomplete experience for CherryPick DI users
- No functional or API changes; documentation/dev experience only

cherrypick_annotations/lib/src/inject.dart

@@ -13,22 +13,30 @@
 
 import 'package:meta/meta.dart';
 
-/// Annotation for field injection in CherryPick DI framework.
-/// Apply this to a field, and the code generator will automatically inject
-/// the appropriate dependency into it.
+/// Marks a field for dependency injection by CherryPick's code generator.
 ///
-/// ---
+/// Use `@inject()` on fields within a class marked with `@injectable()`.
+/// Such fields will be automatically injected from the DI [Scope]
+/// when using the generated mixin or calling `.injectFields()`.
 ///
-/// Аннотация для внедрения зависимости в поле через фреймворк CherryPick DI.
-/// Поместите её на поле класса — генератор кода автоматически подставит нужную зависимость.
-///
-/// Example / Пример:
+/// Example:
 /// ```dart
-/// @inject()
-/// late final SomeService service;
+/// import 'package:cherrypick_annotations/cherrypick_annotations.dart';
+///
+/// @injectable()
+/// class LoginScreen with _\$LoginScreen {
+///   @inject()
+///   late final AuthService authService;
+///
+///   @inject()
+///   @named('main')
+///   late final ApiClient api;
+/// }
+///
+/// // After running build_runner, call:
+/// // LoginScreen().injectFields();
 /// ```
 @experimental
-// ignore: camel_case_types
 final class inject {
   const inject();
 }