feat: improve iFlow cookie auth UX with duplicate config handling

- Add 409 conflict handling for duplicate iFlow config files
  - Add key creation hint in cookie login section
  - Move extra actions button after delete button for consistency
  - Improve OAuth status badge display logic (hide when idle)
  - Add config toggle enable/disable i18n translations
  - Adjust item-actions spacing from sm to md

src/i18n/locales/zh-CN.json

@@ -148,6 +148,8 @@
     "excluded_models_placeholder": "用逗号或换行分隔，例如: gemini-1.5-pro, gemini-1.5-flash",
     "excluded_models_hint": "留空表示不过滤；保存时会自动去重并忽略空白。",
     "excluded_models_count": "排除 {{count}} 个模型",
+    "config_toggle_label": "启用",
+    "config_disabled_badge": "已停用",
     "codex_title": "Codex API 配置",
     "codex_add_button": "添加配置",
     "codex_empty_title": "暂无Codex配置",
@@ -445,10 +447,13 @@
     "iflow_cookie_label": "Cookie 内容:",
     "iflow_cookie_placeholder": "粘贴浏览器中的 Cookie，例如 sessionid=...;",
     "iflow_cookie_hint": "直接提交 Cookie 以完成登录（无需打开授权链接），服务端将自动保存凭据。",
+    "iflow_cookie_key_hint": "提示：需在平台上先创建 Key。",
     "iflow_cookie_button": "提交 Cookie 登录",
     "iflow_cookie_status_success": "Cookie 登录成功，凭据已保存。",
     "iflow_cookie_status_error": "Cookie 登录失败:",
+    "iflow_cookie_status_duplicate": "配置文件重复:",
     "iflow_cookie_start_error": "提交 Cookie 登录失败:",
+    "iflow_cookie_config_duplicate": "检测到配置文件已存在（重复），如需重新保存请先删除原文件后重试。",
     "iflow_cookie_required": "请先填写 Cookie 内容",
     "iflow_cookie_result_title": "Cookie 登录结果",
     "iflow_cookie_result_email": "账号",
@@ -636,6 +641,8 @@
     "claude_config_added": "Claude配置添加成功",
     "claude_config_updated": "Claude配置更新成功",
     "claude_config_deleted": "Claude配置删除成功",
+    "config_enabled": "配置已启用",
+    "config_disabled": "配置已停用",
     "field_required": "必填字段不能为空",
     "openai_provider_required": "请填写提供商名称和Base URL",
     "openai_provider_added": "OpenAI提供商添加成功",