Refactor Auth and HDFS controllers, fix User model, and improve HDFS config

- Rewrote AuthController to inject all dependencies via constructor
- Fixed token refresh/login logic and added rate limiter and blacklist support
- Implemented getters in LoginRequest DTO
- Updated User model to implement UserDetails and extend entity.User
- Switched HDFScontroller to use entity.User instead of models.User
- Rewrote HDFSConfig to include static getHDFS() method and secure config via env vars
- Simplified JwtService, added overload for entity.User, and fixed key handling

src/main/java/com/skycrate/backend/skycrateBackend/models/User.java

@@ -1,6 +1,5 @@
 package com.skycrate.backend.skycrateBackend.models;
 
-import java.time.LocalDateTime;
 import java.util.Collection;
 import java.util.Date;
 import java.util.List;
@@ -13,7 +12,7 @@ import jakarta.persistence.*;
 
 @Table(name = "users")
 @Entity
-public class User implements UserDetails {
+public class User extends com.skycrate.backend.skycrateBackend.entity.User implements UserDetails {
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)