feat(homework,classes,course-plans): add scans, student data, take confirm, error boundaries, dialogs, hooks, calendar

homework:

- Add data-access-scans, data-access-student, data-access-utils, data-access-exam-cross

- Add excellent-submissions, homework-take-confirm-dialog, homework-take-sidebar components

classes:

- Add class-delete-dialog, class-error-boundary, class-form-dialog, class-form-utils

- Add class-list-table, class-list-toolbar, class-skeleton

- Add schedule-create-dialog, schedule-delete-dialog, schedule-edit-dialog, schedule-utils

- Add data-access-teacher and hooks directory

course-plans:

- Add course-plan-calendar, sortable-week-row, template-picker-dialog components

- Add lib directory

src/modules/classes/data-access-schedule.ts

@@ -18,6 +18,19 @@ import {
   getSessionTeacherId,
 } from "./data-access"
 
+/**
+ * 根据课表项 ID 获取其所属班级 ID（P0-3 审计修复：供 actions-schedule 越权校验使用）。
+ * classes 模块对 classSchedule 表有读权限（usedBy 含 classes）。
+ */
+export async function getClassIdByScheduleId(scheduleId: string): Promise<string | null> {
+  const [row] = await db
+    .select({ classId: classSchedule.classId })
+    .from(classSchedule)
+    .where(eq(classSchedule.id, scheduleId))
+    .limit(1)
+  return row?.classId ?? null
+}
+
 const isWeekday = (n: unknown): n is 1 | 2 | 3 | 4 | 5 | 6 | 7 =>
   typeof n === "number" && n >= 1 && n <= 7 && Number.isInteger(n)