feat(jpa): add JPA entities and repositories aligned to Flyway; chore(deps): remove unused AMQP deps

src/main/java/com/mosquito/project/persistence/entity/MultiLevelRewardRuleEntity.java

@@ -0,0 +1,37 @@
+package com.mosquito.project.persistence.entity;
+
+import jakarta.persistence.*;
+import java.math.BigDecimal;
+
+@Entity
+@Table(name = "multi_level_reward_rules")
+public class MultiLevelRewardRuleEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "activity_id", nullable = false)
+    private Long activityId;
+
+    @Column(nullable = false)
+    private Integer level;
+
+    @Column(name = "reward_value", nullable = false, precision = 10, scale = 2)
+    private BigDecimal rewardValue;
+
+    @Column(name = "is_percentage")
+    private Boolean percentage;
+
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+    public Long getActivityId() { return activityId; }
+    public void setActivityId(Long activityId) { this.activityId = activityId; }
+    public Integer getLevel() { return level; }
+    public void setLevel(Integer level) { this.level = level; }
+    public BigDecimal getRewardValue() { return rewardValue; }
+    public void setRewardValue(BigDecimal rewardValue) { this.rewardValue = rewardValue; }
+    public Boolean getPercentage() { return percentage; }
+    public void setPercentage(Boolean percentage) { this.percentage = percentage; }
+}
+