Refactor and secure backend configuration, DTOs, and authentication flow

- Updated pom.xml: removed redundant tags, grouped dependencies, added scopes, and upgraded plugins
- Enhanced RegisterUserDto with validation annotations and added missing fields (username, fullname)
- Updated User entity with builder constructor and removed redundant getters/setters
- Completed FileMetadata entity with Lombok and required setters/getters
- Improved HDFSConfig with correct annotation and clearer exception message
- Adjusted HTTP to HTTPS redirect port (8085 -> 8443)
- Allowed /actuator/** in SecurityConfig and disabled deprecated XSS protection
- Skipped JWT filter for /api/auth and /actuator paths
- Refactored AuthenticationService to use builder pattern and RSA key injection
- Fixed application.properties for static MySQL connection (removed ${MYSQL_PASSWORD})

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

@@ -14,7 +14,6 @@ import java.util.List;
 @Setter
 @NoArgsConstructor
 @AllArgsConstructor
-@Builder
 public class User implements UserDetails {
 
     @Id
@@ -39,6 +38,16 @@ public class User implements UserDetails {
     @Lob
     private byte[] privateKey;
 
+    @Builder
+    public User(String email, String password, String username, String fullname, byte[] publicKey, byte[] privateKey) {
+        this.email = email;
+        this.password = password;
+        this.username = username;
+        this.fullname = fullname;
+        this.publicKey = publicKey;
+        this.privateKey = privateKey;
+    }
+
     // --- UserDetails interface methods ---
     @Override
     public Collection<? extends GrantedAuthority> getAuthorities() {
@@ -74,45 +83,4 @@ public class User implements UserDetails {
     public boolean isEnabled() {
         return true;
     }
-
-    // --- Extra getter methods for HDFScontroller compatibility ---
-    public byte[] getPublicKey() {
-        return publicKey;
-    }
-
-    public byte[] getPrivateKey() {
-        return privateKey;
-    }
-
-    public String getFullname() {
-        return fullname;
-    }
-
-    public Long getId() {
-        return id;
-    }
-
-    public String getUsername() {
-        return username;
-    }
-
-    public void setUsername(String username) {
-        this.username = username;
-    }
-
-    public String getEmail() {
-        return email;
-    }
-
-    public void setEmail(String email) {
-        this.email = email;
-    }
-
-    public String getPassword() {
-        return password;
-    }
-
-    public void setPassword(String password) {
-        this.password = password;
-    }
 }