Refactor: Align with php-mcp/server v2.x and Enhance Laravel DX

[CodeWithKyrian]

This PR introduces a comprehensive overhaul to achieve full compatibility with php-mcp/server v2.x.x+ and significantly enhance the developer experience for Laravel users.

Key Goals Achieved:

• Modernized Core Integration: Utilizes the php-mcp/server v2.x ServerBuilder, explicit discovery mechanisms, clear transport separation, and the new Configuration value object.
• "Laravely" Developer Experience:
  • Introduced a fluent API for manual MCP element registration via the Mcp Facade and a dedicated definitions file (e.g., routes/mcp.php), similar to defining Laravel routes.
  • Seamlessly integrates with Laravel's service container (for handler DI), cache (with fallback), logger, and event system.
  • Configuration is now more robust and aligned with Laravel conventions via config/mcp.php.
• Flexible Transport Management:
  • The mcp:serve Artisan command now clearly supports stdio and a dedicated http (ReactPHP-based) transport, with CLI options for configuration.
  • The integrated HTTP+SSE transport (via Laravel routes and McpController) has been re-architected to correctly use a custom LaravelHttpTransport that bridges with the core MCP Protocol handler.
• Clear Discovery & Caching: Auto-discovery in development is configurable, and the mcp:discover command provides explicit control over discovery and caching. Manual registrations always take precedence.
• Namespace Standardization: The package's base namespace has been updated to PhpMcp\Laravel for better clarity and convention.

Major Changes Include:

• McpServiceProvider: Rebuilt to use ServerBuilder for \PhpMcp\Server\Server instantiation, correctly wiring all Laravel dependencies and applying configurations. Implements configurable auto-discovery.
• McpRegistrar & BluePrint Objects: Power the new fluent facade API for manual registrations.
• Updated config/mcp.php: New structure, new keys for dedicated HTTP transport, simplified cache and discovery settings.
• Artisan Commands (mcp:discover, mcp:list, mcp:serve): Refactored to interact with the new Server instance and core transport implementations. mcp:serve now offers an interactive prompt for transport selection.
• LaravelHttpTransport & McpController: Reworked for correct interaction with the core Protocol when serving MCP via integrated Laravel routes. The controller now drives events on the custom transport.
• Event System: Core server list change notifiers now dispatch Laravel events, handled by McpNotificationListener to queue MCP notifications.

This refactor addresses previous architectural limitations and aims to make php-mcp/laravel the definitive way to build MCP-enabled Laravel applications.

BREAKING CHANGES: (To be detailed in Release Notes)

• Namespace change from PhpMcp\Laravel\Server to PhpMcp\Laravel.
• Significant changes to config/mcp.php structure and keys.
• The old ConfigAdapter is removed.
• Internal workings of how the Server is built and configured have changed; direct manipulation of old internal classes will break.
• The mcp:serve command's behavior for HTTP transport now launches a dedicated server by default (use integrated routes for embedded functionality).