feat: 新增用户地址、收藏、商品评价和订单项模块

- 新增 UserAddress/UserFavorite/ProductReview/OrderItem 实体类
- 新增对应的 DTO、Repository、Service 和 Controller
- 新增 OrderMigrationService 订单数据迁移服务

src/main/java/com/org/flashsalesystem/entity/OrderItem.java

@@ -0,0 +1,50 @@
+package com.org.flashsalesystem.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "order_items")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class OrderItem {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "order_id", nullable = false)
+    private Long orderId;
+
+    @Column(name = "product_id", nullable = false)
+    private Long productId;
+
+    @Column(name = "product_name", nullable = false, length = 200)
+    private String productName;
+
+    @Column(name = "product_image_url", length = 500)
+    private String productImageUrl;
+
+    @Column(name = "price", nullable = false, precision = 10, scale = 2)
+    private BigDecimal price;
+
+    @Column(name = "quantity", nullable = false)
+    private Integer quantity;
+
+    @Column(name = "subtotal", nullable = false, precision = 10, scale = 2)
+    private BigDecimal subtotal;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    @PrePersist
+    protected void onCreate() {
+        createdAt = LocalDateTime.now();
+    }
+}

src/main/java/com/org/flashsalesystem/entity/ProductReview.java

@@ -0,0 +1,63 @@
+package com.org.flashsalesystem.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "product_reviews", uniqueConstraints = {
+        @UniqueConstraint(name = "uk_review_order_user_product", columnNames = {"order_id", "user_id", "product_id"})
+})
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class ProductReview {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "product_id", nullable = false)
+    private Long productId;
+
+    @Column(name = "user_id", nullable = false)
+    private Long userId;
+
+    @Column(name = "order_id", nullable = false)
+    private Long orderId;
+
+    @Column(nullable = false)
+    private Integer rating = 5;
+
+    @Column(nullable = false, columnDefinition = "TEXT")
+    private String content;
+
+    @Column(nullable = false)
+    private Integer status = 1;
+
+    @Column(name = "admin_reply", columnDefinition = "TEXT")
+    private String adminReply;
+
+    @Column(name = "replied_at")
+    private LocalDateTime repliedAt;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    @Column(name = "updated_at")
+    private LocalDateTime updatedAt;
+
+    @PrePersist
+    protected void onCreate() {
+        createdAt = LocalDateTime.now();
+        updatedAt = LocalDateTime.now();
+    }
+
+    @PreUpdate
+    protected void onUpdate() {
+        updatedAt = LocalDateTime.now();
+    }
+}

src/main/java/com/org/flashsalesystem/entity/UserAddress.java

@@ -0,0 +1,61 @@
+package com.org.flashsalesystem.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "user_addresses")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class UserAddress {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "user_id", nullable = false)
+    private Long userId;
+
+    @Column(nullable = false, length = 100)
+    private String name;
+
+    @Column(nullable = false, length = 20)
+    private String phone;
+
+    @Column(length = 50)
+    private String province;
+
+    @Column(length = 50)
+    private String city;
+
+    @Column(length = 50)
+    private String district;
+
+    @Column(nullable = false, length = 255)
+    private String address;
+
+    @Column(name = "is_default", nullable = false)
+    private Boolean isDefault = false;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    @Column(name = "updated_at")
+    private LocalDateTime updatedAt;
+
+    @PrePersist
+    protected void onCreate() {
+        createdAt = LocalDateTime.now();
+        updatedAt = LocalDateTime.now();
+    }
+
+    @PreUpdate
+    protected void onUpdate() {
+        updatedAt = LocalDateTime.now();
+    }
+}

src/main/java/com/org/flashsalesystem/entity/UserFavorite.java

@@ -0,0 +1,36 @@
+package com.org.flashsalesystem.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "user_favorites", uniqueConstraints = {
+        @UniqueConstraint(name = "uk_favorite_user_product", columnNames = {"user_id", "product_id"})
+})
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class UserFavorite {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "user_id", nullable = false)
+    private Long userId;
+
+    @Column(name = "product_id", nullable = false)
+    private Long productId;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    @PrePersist
+    protected void onCreate() {
+        createdAt = LocalDateTime.now();
+    }
+}