feat(frontend): Fast/Flex 策略支持搜索选择用户

将手工 User ID 输入替换为带防抖的邮箱模糊搜索和多选标签，同时继续保存 user_ids。

回显已有用户邮箱并保留无法解析的历史 ID，补齐中英文文案路径及组件回归测试。

frontend/src/i18n/__tests__/openaiFastPolicyLocales.spec.ts

@@ -0,0 +1,30 @@
+import { describe, expect, it } from 'vitest'
+
+import en from '../locales/en'
+import zh from '../locales/zh'
+
+describe('OpenAI Fast/Flex policy locale keys', () => {
+  it('exposes user scope copy at the runtime zh path', () => {
+    expect(zh.admin.settings.openaiFastPolicy).toMatchObject({
+      userIds: '指定用户',
+      userIdsHint: '输入任意邮箱关键词进行模糊搜索。留空表示对全部 Sub2API 用户生效；选中用户的 API Key 请求优先匹配用户规则。',
+      userSearchPlaceholder: '输入用户邮箱搜索',
+      userSearchEmpty: '未找到匹配用户',
+      userDeleted: '（已删除）',
+      userIdFallback: '用户 #{id}',
+      removeUser: '移除用户'
+    })
+  })
+
+  it('exposes user scope copy at the runtime en path', () => {
+    expect(en.admin.settings.openaiFastPolicy).toMatchObject({
+      userIds: 'Specific users',
+      userIdsHint: 'Type any part of a user email to search. Leave empty to apply to all Sub2API users. Selected users match requests from their API keys and take precedence over global rules.',
+      userSearchPlaceholder: 'Search by user email',
+      userSearchEmpty: 'No matching users found',
+      userDeleted: '(deleted)',
+      userIdFallback: 'User #{id}',
+      removeUser: 'Remove user'
+    })
+  })
+})

frontend/src/i18n/locales/en/admin/settings.ts

@@ -979,11 +979,6 @@ export default {
         scopeOAuth: 'OAuth only',
         scopeAPIKey: 'API Key only',
         scopeBedrock: 'Bedrock only',
-        userIds: 'Specific user IDs',
-        userIdsHint: 'Leave empty to apply to all Sub2API users. Specified users match requests from their API keys and take precedence over global rules.',
-        userIdPlaceholder: 'e.g., 1001',
-        addUserId: 'Add user ID',
-        removeUserId: 'Remove user ID',
         errorMessage: 'Error message',
         errorMessagePlaceholder: 'Custom error message when blocked',
         errorMessageHint: 'Leave empty for default message',
@@ -1024,6 +1019,13 @@ export default {
         scopeOAuth: 'OAuth only',
         scopeAPIKey: 'API Key only',
         scopeBedrock: 'Bedrock only',
+        userIds: 'Specific users',
+        userIdsHint: 'Type any part of a user email to search. Leave empty to apply to all Sub2API users. Selected users match requests from their API keys and take precedence over global rules.',
+        userSearchPlaceholder: 'Search by user email',
+        userSearchEmpty: 'No matching users found',
+        userDeleted: '(deleted)',
+        userIdFallback: 'User #{id}',
+        removeUser: 'Remove user',
         errorMessage: 'Error message',
         errorMessagePlaceholder: 'Custom error message when blocked',
         errorMessageHint: 'Leave empty for the default message.',

frontend/src/i18n/locales/zh/admin/settings.ts

@@ -974,11 +974,6 @@ export default {
         scopeOAuth: '仅 OAuth 账号',
         scopeAPIKey: '仅 API Key 账号',
         scopeBedrock: '仅 Bedrock 账号',
-        userIds: '指定用户 ID',
-        userIdsHint: '留空表示对全部 Sub2API 用户生效。指定后仅匹配这些用户的 API Key 请求，且优先于全局规则。',
-        userIdPlaceholder: '例如: 1001',
-        addUserId: '添加用户 ID',
-        removeUserId: '移除用户 ID',
         errorMessage: '错误消息',
         errorMessagePlaceholder: '拦截时返回的自定义错误消息',
         errorMessageHint: '留空则使用默认错误消息',
@@ -1019,6 +1014,13 @@ export default {
         scopeOAuth: '仅 OAuth 账号',
         scopeAPIKey: '仅 API Key 账号',
         scopeBedrock: '仅 Bedrock 账号',
+        userIds: '指定用户',
+        userIdsHint: '输入任意邮箱关键词进行模糊搜索。留空表示对全部 Sub2API 用户生效；选中用户的 API Key 请求优先匹配用户规则。',
+        userSearchPlaceholder: '输入用户邮箱搜索',
+        userSearchEmpty: '未找到匹配用户',
+        userDeleted: '（已删除）',
+        userIdFallback: '用户 #{id}',
+        removeUser: '移除用户',
         errorMessage: '错误消息',
         errorMessagePlaceholder: '拦截时返回的自定义错误消息',
         errorMessageHint: '留空则使用默认错误消息。',