feat: add point mall redemption

backend/src/main/java/com/openisle/model/PointGood.java

@@ -0,0 +1,26 @@
+package com.openisle.model;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+/** Item available in the point mall. */
+@Entity
+@Getter
+@Setter
+@NoArgsConstructor
+@Table(name = "point_goods")
+public class PointGood {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false)
+    private String name;
+
+    @Column(nullable = false)
+    private int cost;
+
+    private String image;
+}