Add Yii framework support #2

Description

Add dedicated Yii support to the DDLess engine.

What's needed

Three files following the existing framework pattern:

• src/frameworks/yii/http_request.php — HTTP handler with Yii bootstrap
• src/frameworks/yii/method_executor.php — Method execution via Yii's DI container
• src/frameworks/yii/task_runner.php — Task runner with full Yii context

Reference

See CONTRIBUTING.md for the step-by-step guide on adding a new framework.
Existing implementations in src/frameworks/laravel/ and src/frameworks/symfony/ can be used as reference.

Labels

enhancement, good first issue, help wanted