add 2.5 pro model

Author: dlarocque

packages/ai/integration/constants.ts

@@ -57,6 +57,7 @@ const modelNames: readonly string[] = [
   'gemini-2.0-flash-lite-001',
   'gemini-2.5-flash',
   'gemini-2.5-flash-lite',
+  'gemini-2.5-pro',
   'gemini-3-pro-preview'
 ];