增加API分页和轻量级查询支持，完善备份恢复功能

主要改动：
- API: 为 /api/pages 添加 lightweight 模式和分页支持
- 备份恢复: 增强 restore API 的错误处理和验证逻辑
- 工具函数: 新增 page-utils 辅助函数
- 会话管理: 优化 session 和 auth 相关逻辑
- 文档: 添加 CLAUDE.md 项目指南，包含编辑器配置注意事项

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/api/pages/route.ts

@@ -1,22 +1,61 @@
-import { NextResponse } from 'next/server';
+import { NextRequest, NextResponse } from 'next/server';
 import { prisma } from '@/lib/prisma';
 import { requireApiAuth } from '@/lib/api-auth';
 import { cleanupAccidentalStandaloneInlineCode, markdownToImportHtml } from '@/lib/markdown-import';
 import { MAX_TITLE_LENGTH, safeParseTags, normalizeTags } from '@/lib/page-utils';
 
-export async function GET() {
+export async function GET(request: NextRequest) {
     const authError = await requireApiAuth();
     if (authError) return authError;
 
     try {
-        const pages = await prisma.page.findMany({
-            orderBy: [{ order: 'asc' }, { createdAt: 'desc' }],
-        });
+        const searchParams = request.nextUrl.searchParams;
+        // lightweight 模式：不返回 content，用于侧边栏等场景
+        const lightweight = searchParams.get('lightweight') === 'true';
+        const page = parseInt(searchParams.get('page') || '0', 10);
+        const limit = parseInt(searchParams.get('limit') || '0', 10);
+
+        // 默认行为：返回所有页面（向后兼容）
+        const usePagination = limit > 0 && limit <= 1000 && page > 0;
+
+        if (!usePagination) {
+            const pages = await prisma.page.findMany({
+                orderBy: [{ order: 'asc' }, { createdAt: 'desc' }],
+            });
+            const parsedPages = pages.map((p) => ({
+                ...p,
+                content: lightweight ? '' : p.content,
+                tags: safeParseTags(p.tags),
+            }));
+            return NextResponse.json(parsedPages);
+        }
+
+        // 分页查询
+        const skip = (page - 1) * limit;
+        const [pages, total] = await Promise.all([
+            prisma.page.findMany({
+                skip,
+                take: limit,
+                orderBy: [{ order: 'asc' }, { createdAt: 'desc' }],
+            }),
+            prisma.page.count(),
+        ]);
+
         const parsedPages = pages.map((p) => ({
             ...p,
+            content: lightweight ? '' : p.content,
             tags: safeParseTags(p.tags),
         }));
-        return NextResponse.json(parsedPages);
+
+        return NextResponse.json({
+            data: parsedPages,
+            pagination: {
+                page,
+                limit,
+                total,
+                totalPages: Math.ceil(total / limit),
+            },
+        });
     } catch {
         return NextResponse.json({ error: 'Error fetching pages' }, { status: 500 });
     }