购买套餐页面更改字段和添加小字提示 & 添加余额管理页面

Co-authored-by: Copilot <copilot@github.com>

src/lib/models/models.ts

@@ -39,6 +39,17 @@ export type Bill = {
   refund: Refund
   resource: Resource
 }
+export type Balance = {
+  id: number
+  resource_id: number
+  bill_no: string
+  amount: number
+  created_at: Date
+  trade: Trade
+  balance_prev: number
+  balance_curr: number
+  bill: Bill
+}
 
 export type Trade = {
   id: number