chore(sync): 同步当前工作区全部变更（学员学号可编辑并留空自动生成等）

RuoYi-Vue/sql/train/v2/patch/016_teacher_accommodation.sql

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+-- ============================================================================
+-- 教师住宿分配（复用 train_accommodation，与学生住宿逻辑隔离）
+--
+-- 1. 新增 occupant_type 区分入住人员类型：student 学员 / teacher 教师
+--    - 存量数据全部为学员住宿，默认值 'student' 保证学生逻辑完全不变
+--    - 教师住宿记录 occupant_type = 'teacher'，enrollment_id 存 train_teacher.id
+-- 2. 删除 fk_accomm_enrollment 外键：教师住宿的 enrollment_id 不再指向
+--    train_enrollment(enrollment_id)，改由业务层按 occupant_type 分别校验
+-- 3. 唯一索引由「全局活唯一(enrollment_id)」改为「按人员类型隔离的活唯一
+--    (occupant_type, enrollment_id)」，避免教师 id 与参训档案 id 数值碰撞
+--
+-- 适配数据库：Kingbase / PostgreSQL（train 模块以该语法为准）
+-- ============================================================================
+
+-- 1. 入住人员类型列
+ALTER TABLE train_accommodation ADD COLUMN occupant_type VARCHAR(16) NOT NULL DEFAULT 'student';
+
+COMMENT ON COLUMN train_accommodation.occupant_type IS '入住人员类型：student 学员 / teacher 教师';
+
+-- 2. 解除参训档案外键约束（教师住宿记录不指向 train_enrollment）
+ALTER TABLE train_accommodation DROP CONSTRAINT IF EXISTS fk_accomm_enrollment;
+
+-- 3. 重建活跃唯一索引：按人员类型隔离
+DROP INDEX IF EXISTS uq_accommodation_enroll;
+
+CREATE UNIQUE INDEX uq_accommodation_occupant
+    ON train_accommodation (occupant_type, enrollment_id)
+    WHERE accommodation_status IN (0, 1);
+
+CREATE INDEX IF NOT EXISTS idx_accommodation_occupant
+    ON train_accommodation (occupant_type, enrollment_id);
+
+-- ============================================================================
+-- MySQL 兼容说明（如需在 MySQL 环境执行，替换为下列语句）：
+--   ALTER TABLE train_accommodation ADD COLUMN occupant_type VARCHAR(16) NOT NULL DEFAULT 'student'
+--       COMMENT '入住人员类型：student 学员 / teacher 教师';
+--   ALTER TABLE train_accommodation DROP FOREIGN KEY fk_accomm_enrollment;
+--   ALTER TABLE train_accommodation DROP INDEX uq_accommodation_enroll;
+--   CREATE UNIQUE INDEX uq_accommodation_occupant
+--       ON train_accommodation (occupant_type, enrollment_id, accommodation_status);
+--   （MySQL 无部分索引，若需「仅活跃唯一」请使用生成列方案，教师模块不依赖该唯一性做业务判断）
+-- ============================================================================