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/utils/request.go

@@ -22,6 +22,7 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
+// Deprecated: use controllers.GetRequest method for the new controllers
 func GetRequest[T any](c *gin.Context) (*dto.Request[T], bool) {
 
 	req, ok := c.Get("request")