refactor(quota): migrate traffic quota from tunnel to user level

- Replace tunnel_quota table with user_quota table
- Add user-level daily/monthly quota tracking and enforcement
- Update user CRUD to include quota configuration
- Migrate backup/restore to use user quota fields
- Update frontend API and UI for user quota management

vite-frontend/src/pages/tunnel/form.ts

@@ -8,8 +8,6 @@ interface TunnelFormInput {
   inNodeId: TunnelChainNode[];
   outNodeId?: TunnelChainNode[];
   trafficRatio: number;
-  dailyQuotaGB?: number;
-  monthlyQuotaGB?: number;
 }
 
 interface TunnelNodeInput {
@@ -26,8 +24,6 @@ export const createTunnelFormDefaults = () => {
     chainNodes: [],
     flow: 1,
     trafficRatio: 1.0,
-    dailyQuotaGB: 0,
-    monthlyQuotaGB: 0,
     inIp: "",
     ipPreference: "",
     status: 1,
@@ -64,14 +60,6 @@ export const validateTunnelForm = (
     errors.trafficRatio = "流量倍率须大于0，支持小数（如 0.5）";
   }
 
-  if ((form.dailyQuotaGB ?? 0) < 0) {
-    errors.dailyQuotaGB = "每日配额不能小于 0";
-  }
-
-  if ((form.monthlyQuotaGB ?? 0) < 0) {
-    errors.monthlyQuotaGB = "每月配额不能小于 0";
-  }
-
   if (form.type === 2) {
     if (!form.outNodeId || form.outNodeId.length === 0) {
       errors.outNodeId = "请至少选择一个出口节点";