[Feature]: 对于同一个模型id可以添加不同的配置

## Summary

例如同一个提供商 deepseek-v4-pro 我有时需要thinking有时不要thinking，目前没法在同一个提供商创建两个 deepseek-v4-pro，只能随时改。

## Component(s) Affected

- [x] Core / Backend (app, agents, config, providers, utils, local_models)
- [ ] Console (frontend web UI)
- [ ] Channels (DingTalk, Feishu, QQ, Discord, iMessage, etc.)
- [ ] Skills
- [ ] CLI
- [ ] Documentation (website)
- [ ] Tests
- [ ] CI/CD
- [ ] Scripts / Deploy

## Proposed Solution

希望可以给每个模型配置一个单独的id，用这个单独的id来区分模型，这样同一个提供商的同一个模型可以出现多次

## Willing to Contribute

- [x] I am willing to open a PR for this feature (after discussion).