feat: fire McpToolsRegistering in MCP boot

Ensures tool handlers are registered when serving MCP HTTP requests,
not just in artisan console context.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/Core/Front/Mcp/Boot.php

@@ -43,5 +43,8 @@ class Boot extends ServiceProvider
     {
         // Fire McpRoutesRegistering event for lazy-loaded modules
         LifecycleEventProvider::fireMcpRoutes();
+
+        // Fire McpToolsRegistering so modules can register tool handlers
+        LifecycleEventProvider::fireMcpTools();
     }
 }