Initial commit: accountbook project

- Node.js backend server
- Frontend application
- Backup script
- Project specification

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

frontend/lib/categories.js

@@ -0,0 +1,31 @@
+export const DEFAULT_CATEGORIES = {
+  expense: [
+    { name: '餐饮', icon: '🍜' },
+    { name: '买菜', icon: '🥬' },
+    { name: '交通', icon: '🚗' },
+    { name: '购物', icon: '🛒' },
+    { name: '娱乐', icon: '🎮' },
+    { name: '房租', icon: '🏠' },
+    { name: '房贷', icon: '🏦' },
+    { name: '亲情卡', icon: '💳' },
+    { name: '水电', icon: '💧' },
+    { name: '衣服', icon: '👔' },
+    { name: '通讯', icon: '📱' },
+    { name: '日用品', icon: '🧴' },
+    { name: '美妆', icon: '💄' },
+    { name: '医疗', icon: '🏥' },
+    { name: '养娃', icon: '👶' },
+    { name: '家电', icon: '📺' },
+    { name: '家具', icon: '🛋️' },
+    { name: '装修', icon: '🔨' },
+    { name: '宠物', icon: '🐕' },
+    { name: '其他', icon: '📝' },
+  ],
+  income: [
+    { name: '工资', icon: '💰' },
+    { name: '奖金', icon: '🎁' },
+    { name: '理财', icon: '📈' },
+    { name: '红包', icon: '🧧' },
+    { name: '其他', icon: '📝' },
+  ],
+};