refactor(imports): use explicit type-only imports across codebase

- Replace standard imports with type-only imports to improve clarity
  and align with TypeScript best practices.
- Ensure consistency across modules by modifying all relevant files.

src/Interfaces/IInternalRoute.ts

@@ -1,5 +1,5 @@
-import { Handler, HttpMethod, Middleware } from '../Types/mod.ts';
-import { IContext, IRouteMatcher } from './mod.ts';
+import type { Handler, HttpMethod, Middleware } from '../Types/mod.ts';
+import type { IContext, IRouteMatcher } from './mod.ts';
 
 /**
  * Represents an internally registered route within the HttpKernel.