更新管理员登录和鉴权逻辑，优化用户体验；重构相关API以支持更安全的身份验证；调整数据库初始化以兼容新字段，确保用户信息安全；修复部分组件样式和功能，提升整体可用性。

app/api/admin/content/route.ts

@@ -5,11 +5,14 @@ import { NextRequest, NextResponse } from 'next/server'
 import fs from 'fs'
 import path from 'path'
 import matter from 'gray-matter'
+import { requireAdminResponse } from '@/lib/admin-auth'
 
 const BOOK_DIR = path.join(process.cwd(), 'book')
 
 // GET: 获取所有章节列表
 export async function GET(req: NextRequest) {
+  const authErr = requireAdminResponse(req)
+  if (authErr) return authErr
   try {
     const chapters = getAllChapters()
     
@@ -28,6 +31,8 @@ export async function GET(req: NextRequest) {
 
 // POST: 创建新章节
 export async function POST(req: NextRequest) {
+  const authErr = requireAdminResponse(req)
+  if (authErr) return authErr
   try {
     const body = await req.json()
     const { title, content, category, tags } = body
@@ -70,6 +75,8 @@ export async function POST(req: NextRequest) {
 
 // PUT: 更新章节
 export async function PUT(req: NextRequest) {
+  const authErr = requireAdminResponse(req)
+  if (authErr) return authErr
   try {
     const body = await req.json()
     const { id, title, content, category, tags } = body
@@ -97,6 +104,8 @@ export async function PUT(req: NextRequest) {
 
 // DELETE: 删除章节
 export async function DELETE(req: NextRequest) {
+  const authErr = requireAdminResponse(req)
+  if (authErr) return authErr
   try {
     const { searchParams } = new URL(req.url)
     const id = searchParams.get('id')