feat: add Subcategory entity

SPCServer/springboot/src/main/java/com/lcaohoanq/shoppe/models/Subcategory.java

@@ -0,0 +1,41 @@
+package com.lcaohoanq.shoppe.models;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.lcaohoanq.shoppe.models.base.BaseEntity;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.SequenceGenerator;
+import jakarta.persistence.Table;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Getter
+@Setter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@Entity
+@Table(name = "subcategories")
+public class Subcategory extends BaseEntity{
+
+    @Id
+    @SequenceGenerator(name = "subcategories_seq", sequenceName = "subcategories_id_seq", allocationSize = 1)
+    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "subcategories_seq")
+    @Column(name="id", unique=true, nullable=false)
+    @JsonProperty("id")
+    private Long id;
+    private String name;
+
+    @ManyToOne
+    @JoinColumn(name = "category_id")
+    private Category category;
+
+}