[Feature]: 账户管理请求增加多个apikey配置，轮询 #4
Description
🎯 Problem Statement
- 如果同一个提供商有两个apiKey，加上模型映射，需要配置两份，希望能出一个类似oneapi的多key轮询
💡 Proposed Solution
- 账户中的apikey支持多个
🔄 Alternatives Considered
No response
🏗️ Component
Backend (API)
⚡ Priority
Medium - Would improve workflow
🎬 Use Cases
- 多key配置能节省很多时间配置相同的模型映射
✅ Acceptance Criteria
No response
🎨 Mockups/Examples
No response
💥 Breaking Changes
No - Fully backward compatible
🔧 Implementation Ideas
No response
✅ Checklist
- I have searched existing issues to ensure this is not a duplicate
- I have provided a clear problem statement and solution
- I understand this is a request and not a guarantee of implementation
- I am willing to help with implementation or testing if needed