feat(lesson-preparation): major update with AI features, schedules, and new components

- Add actions-schedules.ts and data-access-schedules.ts for schedule management

- Add AI differentiation, AI feedback, consistency check dialogs

- Add attachment-picker, curriculum-heatmap, print-view, version-diff-view

- Add lesson-plan-mobile-view and schedule-dialog components

- Add lib: ai-differentiation, ai-feedback, auto-layout, consistency-check,

  curriculum-coverage, export, version-diff

- Add history-slice hook for version history

- Update existing components, hooks, providers, services, types

- Add teacher lesson-plans heatmap and library pages

src/modules/lesson-preparation/services/default-data-service.ts

@@ -18,6 +18,11 @@ import {
 } from "../actions";
 import { getKnowledgePointOptionsAction } from "../actions-kp";
 import { publishLessonPlanHomeworkAction } from "../actions-publish";
+import {
+  getLessonPlanAttachmentsAction,
+  createLessonPlanAttachmentAction,
+  deleteLessonPlanAttachmentAction,
+} from "../actions-attachments";
 import type { LessonPlanDataService } from "../providers/lesson-plan-provider";
 
 /**
@@ -148,5 +153,51 @@ export function createDefaultDataService(): LessonPlanDataService {
       }
       return { success: false, message: res.message, errors: res.errors };
     },
+
+    // V5-5：M6 附件库 UI 集成
+    async getLessonPlanAttachments(planId) {
+      const res = await getLessonPlanAttachmentsAction(planId);
+      if (res.success && res.data) {
+        // 将 DB 层的 Date 转为 ISO string 以匹配 LessonPlanAttachmentOption 类型
+        const items = res.data.items.map((a) => ({
+          id: a.id,
+          planId: a.planId,
+          blockId: a.blockId ?? undefined,
+          fileId: a.fileId,
+          displayName: a.displayName,
+          attachmentType: a.attachmentType,
+          uploadedBy: a.uploadedBy,
+          createdAt: a.createdAt instanceof Date ? a.createdAt.toISOString() : a.createdAt,
+        }));
+        return { success: true, data: { items } };
+      }
+      return { success: false, message: res.message };
+    },
+
+    async createLessonPlanAttachment(input) {
+      const res = await createLessonPlanAttachmentAction(input);
+      if (res.success && res.data) {
+        const a = res.data.attachment;
+        const attachment = a
+          ? {
+              id: a.id,
+              planId: a.planId,
+              blockId: a.blockId ?? undefined,
+              fileId: a.fileId,
+              displayName: a.displayName,
+              attachmentType: a.attachmentType,
+              uploadedBy: a.uploadedBy,
+              createdAt: a.createdAt instanceof Date ? a.createdAt.toISOString() : a.createdAt,
+            }
+          : null;
+        return { success: true, data: { attachment } };
+      }
+      return { success: false, message: res.message };
+    },
+
+    async deleteLessonPlanAttachment(attachmentId) {
+      const res = await deleteLessonPlanAttachmentAction(attachmentId);
+      return { success: res.success, message: res.message };
+    },
   };
 }