feat(lesson-preparation): add AI evaluation, analytics, attachments, calendar, comments, review, substitutes, formative, and version diff

- Add actions-ai-evaluation, actions-analytics, actions-attachments, actions-calendar, actions-comments, actions-formative, actions-questions, actions-review, actions-substitutes

- Add corresponding data-access layers for each new action module

- Add calendar-view, curriculum-map-view, version-diff-viewer components

- Add editor-slice, selection-slice, version-slice hooks for state management

- Add document-diff and scope-check lib utilities

- Add default-question-service and external-questions-bridge services

src/modules/lesson-preparation/actions-calendar.ts

@@ -0,0 +1,49 @@
+/**
+ * M9 日历视图 - Server Actions
+ */
+"use server";
+
+import { z } from "zod";
+import { getCalendarEvents, groupEventsByDate } from "./data-access-calendar";
+import type { LessonPlanCalendarEvent } from "./data-access-calendar";
+import type { ActionState } from "@/shared/types/action-state";
+import { getAuthContext, requirePermission } from "@/shared/lib/auth-guard";
+import { handleActionError } from "@/shared/lib/action-utils";
+import { Permissions } from "@/shared/types/permissions";
+
+const getCalendarEventsSchema = z.object({
+  startDate: z.string().refine((v) => !Number.isNaN(new Date(v).getTime()), "Invalid date"),
+  endDate: z.string().refine((v) => !Number.isNaN(new Date(v).getTime()), "Invalid date"),
+});
+
+/**
+ * 查询当前教师的备课日历事件
+ */
+export async function getCalendarEventsAction(
+  input: Record<string, unknown>,
+): Promise<ActionState<{ events: LessonPlanCalendarEvent[]; grouped: Record<string, LessonPlanCalendarEvent[]> }>> {
+  try {
+    await requirePermission(Permissions.LESSON_PLAN_READ);
+    const parseResult = getCalendarEventsSchema.safeParse(input);
+    if (!parseResult.success) {
+      return { success: false, message: "Invalid input" };
+    }
+    const auth = await getAuthContext();
+    if (!auth.userId) {
+      return { success: false, message: "Unauthorized" };
+    }
+    const events = await getCalendarEvents(
+      auth.userId,
+      new Date(parseResult.data.startDate),
+      new Date(parseResult.data.endDate),
+    );
+    const groupedMap = groupEventsByDate(events);
+    const grouped: Record<string, LessonPlanCalendarEvent[]> = {};
+    for (const [key, value] of groupedMap.entries()) {
+      grouped[key] = value;
+    }
+    return { success: true, data: { events, grouped } };
+  } catch (e) {
+    return handleActionError(e);
+  }
+}