fix(dorm): 人文学院宿舍分配班级树以班级表为准合并全校一年级

班级树改为 xg_class_msg 主数据源（无住宿生也可见），统一入学年口径与学院向上解析，避免代理院一年级列表不全或挂错。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/script/sql/update/宿舍一年级代理班级树核对.sql

@@ -0,0 +1,45 @@
+-- =============================================================================
+-- 宿舍「分配到班级」一年级代理：上线前只读核对
+-- 日期：2026-10-14
+-- =============================================================================
+
+-- 1) 代理配置 vs 人文学院 dept_id
+SELECT config_key, config_value, remark
+FROM sys_config
+WHERE config_key = 'xg.studentLeave.freshmanProxyCollegeId';
+
+SELECT dept_id, dept_name, parent_id, dept_category, status, del_flag
+FROM sys_dept
+WHERE dept_name = '人文学院'
+  AND del_flag = '0';
+
+-- 2) 当前届一年级班级数量（9 月 1 日切届）
+SET @cohort_year = YEAR(CURDATE()) - IF(MONTH(CURDATE()) >= 9, 0, 1);
+SELECT @cohort_year AS cohort_year,
+       COUNT(*) AS freshman_class_cnt
+FROM xg_class_msg
+WHERE deleted = 0
+  AND enrollment_year = @cohort_year;
+
+-- 3) 入学年缺失
+SELECT id, class_name, grade, enrollment_year, college_id, college_name
+FROM xg_class_msg
+WHERE deleted = 0
+  AND enrollment_year IS NULL
+LIMIT 200;
+
+-- 4) 学生学院与班级学院漂移（可选治理）
+SELECT sm.id,
+       sm.student_no,
+       sm.name,
+       sm.college_id AS stu_college,
+       c.college_id AS class_college,
+       c.class_name
+FROM xg_student_msg sm
+JOIN xg_class_msg c ON sm.class_id = c.id AND c.deleted = 0
+WHERE sm.deleted = 0
+  AND sm.student_status = '1'
+  AND sm.college_id IS NOT NULL
+  AND c.college_id IS NOT NULL
+  AND CAST(sm.college_id AS CHAR) <> CAST(c.college_id AS CHAR)
+LIMIT 200;