Add CLI create generators

[rtcoder]

Summary

• add create:module scaffolding for module directories, Module.php, and config.php
• add module-owned generators for controllers, models, services, commands, middleware, and DTOs
• support both --module=Name ClassName and Module:ClassName syntax for artifact generators
• extract generator templates into file-based stubs under src/Console/Generator/stubs
• add zero-dependency .env loading during bootstrap
• add native PDO database config, lazy connection service, query result helpers, and transaction wrapper
• document create commands, generator stubs, .env configuration, and database usage
• cover generator, environment, and database behavior with feature tests

Tests

• composer validate --no-check-publish
• composer dump-autoload
• find src application tests -name '*.php' -print0 | xargs -0 -n1 php -l
• composer test
• php shift.php route:list
• php shift.php health