add router

src/provider/chat-adapter/open-router.ts

@@ -0,0 +1,10 @@
+import { BaseChat, BaseChatOptions } from '../core/chat.ts';
+
+export type OpenRouterOptions = Partial<BaseChatOptions>;
+export class OpenRouterChat extends BaseChat {
+  static BASE_URL = 'https://openrouter.ai/api/v1';
+  constructor(options: OpenRouterOptions) {
+    const baseURL = options.baseURL || OpenRouterChat.BASE_URL;
+    super({ ...(options as BaseChatOptions), baseURL: baseURL });
+  }
+}