feat(db): add migrations for RBAC, diagnostic, messaging, attendance, leave, invitation codes

- 0011: RBAC role flags and seed data

- 0012: diagnostic grade_id

- 0013: message recall

- 0014: message templates

- 0015: group messages and message reports/blocks

- 0016: invitation codes

- 0017: draft device sync

- 0018: attendance status reason

- 0019: attendance warning thresholds

- 0020: leave requests

- 0021: attendance period

drizzle/0019_attendance_warning_thresholds.sql

@@ -0,0 +1,6 @@
+-- L-3：出勤率阈值预警
+-- 新增 attendance_rate_threshold（出勤率阈值，默认 90%）
+-- 新增 consecutive_absence_threshold（连续缺勤阈值，默认 3 次）
+ALTER TABLE `attendance_rules`
+  ADD COLUMN `attendance_rate_threshold` int DEFAULT 90,
+  ADD COLUMN `consecutive_absence_threshold` int DEFAULT 3;