feat(代理): 代理配置按登录用户隔离——桌面端 current_uid 登录同步 + brand 页 proxy_users[uid] 读写，各用户各自代理池各自计费复用（未登录回退全局 proxy_url 兼容旧配置）

frontend-vue/src/pages/brand/components/BrandApiSecretSettingsButton.vue

@@ -163,7 +163,7 @@ import {
   type ApiSecretModuleKey,
   type ApiSecretRetention,
 } from '@/shared/utils/api-secret-store'
-import { getPywebviewApi, type ProxyMode } from '@/shared/bridges/pywebview'
+import { getPywebviewApi, type ProxyMode, type DesktopConfigUpdate } from '@/shared/bridges/pywebview'
 
 type SecretState = {
   value: string
@@ -275,6 +275,39 @@ function clearSecret(moduleKey: ApiSecretModuleKey) {
   ElMessage.success('已清空密钥')
 }
 
+function proxyUserId() {
+  if (typeof window === 'undefined') return '0'
+  return window.localStorage.getItem('uid') || '0'
+}
+
+/** 代理地址按登录用户隔离：proxy_users[uid]，各自计费各自复用；
+ *  未登录（uid=0）回退全局 proxy_url（兼容旧版本已保存的配置）。 */
+function readUserProxy(config: Record<string, unknown> | null | undefined) {
+  const uid = proxyUserId()
+  if (uid !== '0') {
+    const users = (config?.proxy_users ?? {}) as Record<string, unknown>
+    const own = (users[uid] ?? {}) as Record<string, unknown>
+    return {
+      url: typeof own.proxy_url === 'string' ? own.proxy_url : '',
+      mode: Number(own.proxy_mode) === 2 ? 2 : 1,
+    }
+  }
+  return {
+    url: typeof config?.proxy_url === 'string' ? config.proxy_url : '',
+    mode: Number(config?.proxy_mode) === 2 ? 2 : 1,
+  }
+}
+
+function userProxyPatch(nextProxyUrl: string, nextProxyMode: ProxyMode) {
+  const uid = proxyUserId()
+  if (uid === '0') {
+    return { proxy_url: nextProxyUrl, proxy_mode: nextProxyMode }
+  }
+  const users: Record<string, unknown> = {}
+  users[uid] = { proxy_url: nextProxyUrl, proxy_mode: nextProxyMode }
+  return { proxy_users: users }
+}
+
 async function loadProxyConfig() {
   const requestId = ++proxyLoadRequestId
   proxyLoading.value = true
@@ -294,10 +327,9 @@ async function loadProxyConfig() {
   try {
     const config = await api.read_config()
     if (requestId !== proxyLoadRequestId || !dialogVisible.value) return
-    const nextUrl = typeof config?.proxy_url === 'string' ? config.proxy_url : ''
-    const nextMode: ProxyMode = Number(config?.proxy_mode) === 2 ? 2 : 1
-    proxyUrl.value = nextUrl
-    proxyMode.value = nextMode
+    const own = readUserProxy(config as Record<string, unknown>)
+    proxyUrl.value = own.url
+    proxyMode.value = (own.mode === 2 ? 2 : 1) as ProxyMode
     proxyReady.value = true
   } catch (error) {
     if (requestId !== proxyLoadRequestId || !dialogVisible.value) return
@@ -331,10 +363,8 @@ async function saveAll() {
     if (shouldSaveProxy) {
       const api = getPywebviewApi()
       if (!api?.save_config) throw new Error('当前客户端未提供代理配置保存能力')
-      await api.save_config({
-        proxy_url: nextProxyUrl,
-        proxy_mode: nextProxyMode,
-      })
+      // 按登录用户保存：proxy_users[uid]（未登录回退全局 proxy_url 字段）
+      await api.save_config(userProxyPatch(nextProxyUrl, nextProxyMode) as DesktopConfigUpdate)
       proxyUrl.value = nextProxyUrl
       proxyDirty.value = false
     }

frontend-vue/src/pages/login/DesktopLoginPage.vue

@@ -333,6 +333,17 @@ async function submitLogin() {
       } catch {
         /* 忽略 */
       }
+      // 同步登录用户到桌面客户端配置：Python 端按 uid 选用该用户自己的
+      // 代理密钥/代理池（各自计费、各自复用省钱）。网页形态无 pywebview
+      // 桥，静默跳过。
+      try {
+        const bridge = (window as unknown as { pywebview?: { api?: { save_config?: (data: Record<string, unknown>) => Promise<unknown> } } }).pywebview
+        if (bridge?.api && typeof bridge.api.save_config === 'function') {
+          void bridge.api.save_config({ current_uid: String(data.userId) })
+        }
+      } catch {
+        /* 忽略 */
+      }
     }
     if (data.username) {
       try {
@@ -365,6 +376,15 @@ onMounted(() => {
     } catch {
       /* 忽略 */
     }
+    // 同步清掉客户端的登录用户标记：Python 端回退到全局/默认代理池
+    try {
+      const bridge = (window as unknown as { pywebview?: { api?: { save_config?: (data: Record<string, unknown>) => Promise<unknown> } } }).pywebview
+      if (bridge?.api && typeof bridge.api.save_config === 'function') {
+        void bridge.api.save_config({ current_uid: '' })
+      }
+    } catch {
+      /* 忽略 */
+    }
     // 显式登出/切号后不再自动登录（保留记住的账号，仅关闭自动登录）
     autoLogin.value = false
     lsSet(AUTO_LOGIN_KEY, '0')

frontend-vue/src/shared/bridges/pywebview.ts

@@ -56,6 +56,8 @@ export interface DesktopConfig {
 export interface DesktopConfigUpdate {
   proxy_url?: string;
   proxy_mode?: ProxyMode;
+  current_uid?: string;
+  proxy_users?: Record<string, { proxy_url?: string; proxy_mode?: number }>;
   aliprice_usename?: string;
   aliprice_pwd?: string;
 }