feat(download): 添加快手下载器并优化下载配置功能

- 新增快手下载器，支持快手视频下载
- 添加下载配置页面，可设置各平台Cookies
- 优化后端接口，增加获取和更新Cookies的功能
- 前端新增Downloader组件和相关表单组件
- 更新路由配置，增加下载配置相关路由

BillNote_frontend/src/constant/note.ts

@@ -1,19 +1,35 @@
 /* -------------------- 常量 -------------------- */
+import {
+  BiliBiliLogo,
+  DouyinLogo,
+  KuaishouLogo,
+  LocalLogo,
+  YoutubeLogo,
+} from '@/components/Icons/platform.tsx'
+
 export const noteFormats = [
-    { label: '目录', value: 'toc' },
-    { label: '原片跳转', value: 'link' },
-    { label: '原片截图', value: 'screenshot' },
-    { label: 'AI总结', value: 'summary' },
+  { label: '目录', value: 'toc' },
+  { label: '原片跳转', value: 'link' },
+  { label: '原片截图', value: 'screenshot' },
+  { label: 'AI总结', value: 'summary' },
 ] as const
 
 export const noteStyles = [
-    { label: '精简', value: 'minimal' },
-    { label: '详细', value: 'detailed' },
-    { label: '教程', value: 'tutorial' },
-    { label: '学术', value: 'academic' },
-    { label: '小红书', value: 'xiaohongshu' },
-    { label: '生活向', value: 'life_journal' },
-    { label: '任务导向', value: 'task_oriented' },
-    { label: '商业风格', value: 'business' },
-    { label: '会议纪要', value: 'meeting_minutes' },
-] as const
+  { label: '精简', value: 'minimal' },
+  { label: '详细', value: 'detailed' },
+  { label: '教程', value: 'tutorial' },
+  { label: '学术', value: 'academic' },
+  { label: '小红书', value: 'xiaohongshu' },
+  { label: '生活向', value: 'life_journal' },
+  { label: '任务导向', value: 'task_oriented' },
+  { label: '商业风格', value: 'business' },
+  { label: '会议纪要', value: 'meeting_minutes' },
+] as const
+
+export const videoPlatforms = [
+  { label: '哔哩哔哩', value: 'bilibili', logo: BiliBiliLogo },
+  { label: 'YouTube', value: 'youtube', logo: YoutubeLogo },
+  { label: '抖音', value: 'douyin', logo: DouyinLogo },
+  { label: '快手', value: 'kuaishou', logo: KuaishouLogo },
+  { label: '本地视频', value: 'local', logo: LocalLogo },
+] as const