Add Xiaomi MiMo provider support

- Introduced Xiaomi MiMo as a new provider in providerModels.js and providers.js.
- Updated model alias mapping in model.js to include Xiaomi MiMo.
- Enhanced validation route to support Xiaomi MiMo API endpoints.
- Added Xiaomi MiMo to APIKEY_PROVIDERS with relevant details.

This update expands the range of supported providers, improving integration capabilities.

open-sse/config/providers.js

@@ -372,6 +372,10 @@ export const PROVIDERS = {
     baseUrl: "https://api.cloudflare.com/client/v4/accounts/{accountId}/ai/v1/chat/completions",
     format: "openai"
   },
+  "xiaomi-mimo": {
+    baseUrl: "https://api.xiaomimimo.com/v1/chat/completions",
+    format: "openai"
+  },
 };
 
 export const OLLAMA_LOCAL_DEFAULT_HOST = "http://localhost:11434";