refactor: transitioned auth controller to use the new controller structure;

feat: setup DI for controllers;
refactor: marked old utils and routes package parts as deprecated

backend/internal/routes/setup.go

@@ -21,9 +21,10 @@ import (
     "go.uber.org/fx"
 )
 
+// Deprecated: no longer used, see controllers
 var Module = fx.Module("routes",
-    fx.Provide(
-        NewRouteGroups,
-    ),
-    fx.Invoke(NewRouter),
+    // fx.Provide(
+    //     NewRouteGroups,
+    // ),
+    // fx.Invoke(NewRouter),
 )