BREAKING_CHANGE(core): remove legacy forwarding module in favor of route-based system

- Removed the forwarding namespace export from main index
- Removed TForwardingType and all forwarding handlers
- Consolidated route helper functions into route-helpers.ts
- All functionality is now available through the route-based system
- Users must migrate from forwarding.* imports to direct route helper imports

test/test.route-utils.ts

@@ -47,7 +47,7 @@ import {
   addRateLimiting,
   addBasicAuth,
   addJwtAuth
-} from '../ts/proxies/smart-proxy/utils/route-patterns.js';
+} from '../ts/proxies/smart-proxy/utils/route-helpers.js';
 
 import type {
   IRouteConfig,