feat(pool,priority): 号池聚合显示、API 格式归一化与优先级管理重构

- 优先级管理对话框按 family 分组显示 API 格式，号池 key 聚合为单条目展示
- 拖拽排序改用 key ID 替代数组索引，号池聚合项禁用拖拽/编辑/开关操作
- 后端 key 分组查询增加 API 格式键归一化，返回 provider_id
- 提取 OAuth auth_config 解密逻辑，新增 _derive_oauth_expires_at 从加密配置派生过期时间
- 号池管理移除会话列，调整 OAuth 过期信息与刷新按钮的布局顺序

frontend/src/api/endpoints/types/api-format.ts

@@ -73,6 +73,62 @@ export const API_FORMAT_ORDER: string[] = [
   API_FORMATS.GEMINI_VIDEO,
 ]
 
+// Family 显示名称映射
+export const API_FORMAT_FAMILY_LABELS: Record<string, string> = {
+  openai: 'OpenAI',
+  claude: 'Claude',
+  gemini: 'Gemini',
+}
+
+// Kind 显示名称映射
+export const API_FORMAT_KIND_LABELS: Record<string, string> = {
+  chat: 'Chat',
+  cli: 'CLI',
+  compact: 'Compact',
+  video: 'Video',
+}
+
+// Family 排序顺序
+const FAMILY_ORDER = ['openai', 'claude', 'gemini']
+
+// 工具函数：从 API 格式中提取 family 和 kind
+export function parseApiFormat(format: string): { family: string; kind: string } {
+  const idx = format.indexOf(':')
+  if (idx === -1) return { family: format.toLowerCase(), kind: '' }
+  return { family: format.slice(0, idx).toLowerCase(), kind: format.slice(idx + 1).toLowerCase() }
+}
+
+// 工具函数：按 family 分组并排序 API 格式数组
+export interface ApiFormatGroup {
+  family: string
+  label: string
+  formats: string[]
+}
+
+export function groupApiFormats(formats: string[]): ApiFormatGroup[] {
+  const sorted = sortApiFormats(formats)
+  const groups = new Map<string, string[]>()
+  for (const f of sorted) {
+    const { family } = parseApiFormat(f)
+    if (!groups.has(family)) groups.set(family, [])
+    groups.get(family)?.push(f)
+  }
+  return [...groups.entries()]
+    .sort(([a], [b]) => {
+      const ai = FAMILY_ORDER.indexOf(a)
+      const bi = FAMILY_ORDER.indexOf(b)
+      if (ai === -1 && bi === -1) return 0
+      if (ai === -1) return 1
+      if (bi === -1) return -1
+      return ai - bi
+    })
+    .map(([family, fmts]) => ({
+      family,
+      label: API_FORMAT_FAMILY_LABELS[family] || family,
+      formats: fmts,
+    }))
+}
+
 // 工具函数：将 API 格式签名转为友好显示名称
 export function formatApiFormat(format: string | null | undefined): string {
   if (!format) return '-'