feat(script-favorite): add ScriptFavorite entity

- Extends BaseEntity for id, createTime, updateTime, isDeleted
- Maps to t_script_favorite table via MyBatis-Plus @TableName
- Fields: userId, scriptId

server/src/main/java/com/emotion/entity/ScriptFavorite.java

@@ -0,0 +1,31 @@
+package com.emotion.entity;
+
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableName;
+import com.emotion.common.BaseEntity;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NoArgsConstructor;
+import lombok.experimental.SuperBuilder;
+
+/**
+ * 剧本收藏关联实体
+ *
+ * @author huazhongmin
+ * @date 2026-07-19
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+@SuperBuilder
+@NoArgsConstructor
+@AllArgsConstructor
+@TableName("t_script_favorite")
+public class ScriptFavorite extends BaseEntity {
+
+    @TableField("user_id")
+    private String userId;
+
+    @TableField("script_id")
+    private String scriptId;
+}