feat: add auth enitiies and repos

src/main/java/dev/gfxv/blps/entity/Role.java

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+package dev.gfxv.blps.entity;
+
+import jakarta.persistence.*;
+import lombok.AccessLevel;
+import lombok.Data;
+import lombok.Getter;
+import lombok.experimental.FieldDefaults;
+
+@Entity
+@Table(name = "roles")
+@FieldDefaults(level = AccessLevel.PRIVATE)
+public class Role {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    Long id;
+
+    @Column(name = "name", nullable = false, unique = true)
+    String name;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

src/main/java/dev/gfxv/blps/entity/User.java

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+package dev.gfxv.blps.entity;
+
+import jakarta.persistence.*;
+import lombok.AccessLevel;
+import lombok.Data;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.experimental.FieldDefaults;
+
+import java.util.HashSet;
+import java.util.Set;
+
+@Entity
+@Table(name = "users")
+@FieldDefaults(level = AccessLevel.PRIVATE)
+public class User {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    Long id;
+
+    @Column(name = "username", nullable = false, unique = true)
+    String username;
+
+    @Column(name = "email", nullable = false, unique = true)
+    String email;
+
+    @Column(name = "password", nullable = false)
+    String password;
+
+    @ManyToMany(fetch = FetchType.EAGER)
+    @JoinTable(
+            name = "user_roles",
+            joinColumns = @JoinColumn(name = "user_id"),
+            inverseJoinColumns = @JoinColumn(name = "role_id")
+    )
+    Set<Role> roles = new HashSet<>();
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = 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;
+    }
+
+    public Set<Role> getRoles() {
+        return roles;
+    }
+
+    public void setRoles(Set<Role> roles) {
+        this.roles = roles;
+    }
+}

src/main/java/dev/gfxv/blps/repository/RoleRepository.java

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+package dev.gfxv.blps.repository;
+
+import dev.gfxv.blps.entity.Role;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface RoleRepository extends JpaRepository<Role, Long> {
+    Optional<Role> findByName(String name);
+}

src/main/java/dev/gfxv/blps/repository/UserRepository.java

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+package dev.gfxv.blps.repository;
+
+import dev.gfxv.blps.entity.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface UserRepository extends JpaRepository<User, Long> {
+    Optional<User> findByUsername(String username);
+    Boolean existsByUsername(String username);
+    Boolean existsByEmail(String email);
+}