feat(usage): 记录并展示失败请求(用户端+管理端)

- 记录失败请求并在用户端/管理端展示;分类下拉改用统一 Select 组件
- 模型过滤改后端 ILIKE 模糊匹配;新增「Key 名称」列(含已删除标记)与按 Key 过滤;时间列移至末列
- 用户可见「已删除 key 失败请求」:OpsErrorLogFilter 加 MatchDeletedKeyOwner,用户侧归属
  放宽为 (user_id OR deleted_key_owner_user_id),让 key 原所有者能看到删除 key 后继续请求
  导致的认证失败记录(他人仍 NotFound,不泄露存在性)
- 迁移 148:ops_error_logs 用户+时间索引

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/views/admin/SettingsView.vue

@@ -4398,6 +4398,35 @@
               </div>
             </div>
           </div>
+
+        <!-- Usage Records Settings -->
+        <div class="card">
+          <div class="border-b border-gray-100 px-6 py-4 dark:border-dark-700">
+            <h2 class="text-lg font-semibold text-gray-900 dark:text-white">
+              {{ t('admin.settings.usageRecords.title') }}
+            </h2>
+            <p class="mt-1 text-sm text-gray-500 dark:text-gray-400">
+              {{ t('admin.settings.usageRecords.description') }}
+            </p>
+          </div>
+          <div class="space-y-4 p-6">
+            <!-- User error requests visibility -->
+            <div class="flex items-center justify-between">
+              <div>
+                <label class="text-sm font-medium text-gray-700 dark:text-gray-300">
+                  {{ t('admin.settings.user_error_view.label') }}
+                </label>
+                <p class="text-xs text-gray-500 dark:text-gray-400">
+                  {{ t('admin.settings.user_error_view.description') }}
+                </p>
+              </div>
+              <label class="toggle">
+                <input v-model="form.allow_user_view_error_requests" type="checkbox" />
+                <span class="toggle-slider"></span>
+              </label>
+            </div>
+          </div>
+        </div>
         </div>
         <!-- /Tab: Gateway — Claude Code, Scheduling -->
 
@@ -7190,6 +7219,8 @@ const form = reactive<SettingsForm>({
   available_channels_enabled: false,
   // Affiliate (邀请返利) feature switch
   affiliate_enabled: false,
+  // Allow user view error requests
+  allow_user_view_error_requests: false,
 });
 
 const authSourceDefaults = reactive<AuthSourceDefaultsState>(
@@ -8331,6 +8362,7 @@ async function saveSettings() {
       available_channels_enabled: form.available_channels_enabled,
       // Affiliate (邀请返利) feature switch
       affiliate_enabled: form.affiliate_enabled,
+      allow_user_view_error_requests: form.allow_user_view_error_requests,
     };
 
     // 仅当 openai_fast_policy_settings 已成功从后端加载时才回写，