feat: 实现文件夹和书签的持久排序与拖拽功能

apps/server/migrations/0001_init.sql

@@ -15,6 +15,7 @@ create table if not exists bookmark_folders (
   parent_id uuid null references bookmark_folders(id) on delete cascade,
   name text not null,
   visibility text not null default 'private',
+  sort_order integer not null default 0,
   created_at timestamptz not null default now(),
   updated_at timestamptz not null default now()
 );
@@ -25,6 +26,7 @@ create table if not exists bookmarks (
   id uuid primary key default gen_random_uuid(),
   user_id uuid not null references users(id) on delete cascade,
   folder_id uuid null references bookmark_folders(id) on delete set null,
+  sort_order integer not null default 0,
   title text not null,
   url text not null,
   url_normalized text not null,
@@ -37,5 +39,6 @@ create table if not exists bookmarks (
 );
 
 create index if not exists idx_bookmarks_user_updated_at on bookmarks (user_id, updated_at);
+create index if not exists idx_bookmarks_user_folder_sort on bookmarks (user_id, folder_id, sort_order);
 create index if not exists idx_bookmarks_user_url_hash on bookmarks (user_id, url_hash);
 create index if not exists idx_bookmarks_visibility on bookmarks (visibility);