feat(sync): sync class schedules to DingTalk students

Group active schedules by class, resolve enrolled students through DingTalk mappings, reuse shifts and attendance groups, and expose class-based sync status in the admin UI.

apps/server/src/integration/dingtalk.service.ts

@@ -562,24 +562,6 @@ export class DingTalkService {
     return (data.result ?? []).map((s) => ({ id: s.id, name: s.name }));
   }
 
-  /** 按名称查找班次，不存在则创建 */
-  async findOrCreateShift(name: string, startTime: string, endTime: string, opUserId = 'manager'): Promise<number> {
-    const existing = await this.queryShifts(opUserId);
-    const found = existing.find((s) => s.name === name);
-    if (found) return found.id;
-
-    return this.upsertShift({
-      name,
-      owner: opUserId,
-      sections: [{
-        times: [
-          { check_type: 'OnDuty', across: 0, check_time: `1970-01-01 ${startTime}:00`, free_check: false },
-          { check_type: 'OffDuty', across: 0, check_time: `1970-01-01 ${endTime}:00`, free_check: false },
-        ],
-      }],
-      setting: { is_flexible: false, serious_late_minutes: -1, absenteeism_late_minutes: -1 },
-    });
-  }
 
   // ═══════════════════════════════════════════
   // 考勤排班 — 考勤组管理
@@ -672,29 +654,6 @@ export class DingTalkService {
     return all;
   }
 
-  /** 按名称查找考勤组，不存在则创建 */
-  async findOrCreateAttendanceGroup(
-    name: string, ownerUserId: string, memberUserIds: string[], shiftIds: number[],
-  ): Promise<number> {
-    const existing = await this.queryAttendanceGroups(ownerUserId);
-    const found = existing.find((g) => g.group_name === name);
-    if (found) return found.group_id;
-
-    return this.createAttendanceGroup({
-      name,
-      type: 'TURN',
-      owner: ownerUserId,
-      members: memberUserIds.map((uid) => ({
-        role: 'Attendance',
-        type: 'StaffMember',
-        user_id: uid,
-      })),
-      shift_ids: shiftIds,
-      enable_emp_select_class: true,
-      disable_check_without_schedule: false,
-      disable_check_when_rest: true,
-    });
-  }
 
   // ═══════════════════════════════════════════
   // 考勤排班 — 排班分配