fix: FamilyFortuneMapper.selectByFamilyAndDate 添加 @Select SQL 注解

修复 Invalid bound statement (not found) 错误——自定义查询方法
缺少 SQL 绑定，既无 XML 映射文件也无 @Select 注解。

cfc-backend/src/main/java/com/etotem/cfc/mapper/FamilyFortuneMapper.java

@@ -11,6 +11,7 @@ public interface FamilyFortuneMapper extends BaseMapper<FamilyFortune> {
     /**
      * 获取家庭某天的运势信息
      */
+    @Select("SELECT * FROM family_fortune WHERE family_id = #{familyId} AND fortune_date = #{date} LIMIT 1")
     FamilyFortune selectByFamilyAndDate(@Param("familyId") Long familyId, @Param("date") LocalDate date);
     
     /**