feat: OpenAI OAuth账号显示Codex使用量

从响应头提取x-codex-*使用量信息并保存到账号Extra字段，
前端账号列表展示5h/7d窗口的使用进度条。

frontend/src/types/index.ts

@@ -316,6 +316,7 @@ export interface Account {
   platform: AccountPlatform;
   type: AccountType;
   credentials?: Record<string, unknown>;
+  extra?: CodexUsageSnapshot & Record<string, unknown>; // Extra fields including Codex usage
   proxy_id: number | null;
   concurrency: number;
   priority: number;
@@ -361,6 +362,18 @@ export interface AccountUsageInfo {
   seven_day_sonnet: UsageProgress | null;
 }
 
+// OpenAI Codex usage snapshot (from response headers)
+export interface CodexUsageSnapshot {
+  codex_primary_used_percent?: number;        // Weekly limit usage percentage
+  codex_primary_reset_after_seconds?: number; // Seconds until weekly reset
+  codex_primary_window_minutes?: number;      // Weekly window in minutes
+  codex_secondary_used_percent?: number;      // 5h limit usage percentage
+  codex_secondary_reset_after_seconds?: number; // Seconds until 5h reset
+  codex_secondary_window_minutes?: number;    // 5h window in minutes
+  codex_primary_over_secondary_percent?: number; // Overflow ratio
+  codex_usage_updated_at?: string;            // Last update timestamp
+}
+
 export interface CreateAccountRequest {
   name: string;
   platform: AccountPlatform;