feat: Implement initial Codex Pool backend server with comprehensive APIs for configuration, S2A integration, owner management, batch processing, monitoring, and corresponding frontend pages.

backend/internal/api/s2a_clean.go

@@ -14,7 +14,7 @@ import (
 // S2AAccountItem S2A 账号信息
 type S2AAccountItem struct {
 	ID     int    `json:"id"`
-	Email  string `json:"email"`
+	Email  string `json:"account"` // S2A API 返回的字段名是 account
 	Status string `json:"status"`
 }