feat(ai): Fetch Anthropic, Google, and OpenAI models from models.dev instead of OpenRouter

- Updated generate-models.ts to fetch these providers directly from models.dev API
- OpenRouter now only used for xAI and other third-party providers
- Fixed test model IDs to match new model names from models.dev
- Removed unused import from google.ts

packages/ai/src/providers/google.ts

@@ -6,7 +6,6 @@ import {
 	type GenerateContentParameters,
 	GoogleGenAI,
 	type Part,
-	setDefaultBaseUrls,
 } from "@google/genai";
 import { calculateCost } from "../models.js";
 import type {