chore: align @mintel dependencies to 1.9.11 and fix AI model patch

patches/@mintel__payload-ai@1.9.11.patch

@@ -0,0 +1,13 @@
+diff --git a/dist/endpoints/chatEndpoint.js b/dist/endpoints/chatEndpoint.js
+index 85a4a2d1ab757e32a303d9f4b2462436af5e2398..23902b2a18eedb583d8a6ee7028c5e855177880b 100644
+--- a/dist/endpoints/chatEndpoint.js
++++ b/dist/endpoints/chatEndpoint.js
+@@ -49,7 +49,7 @@ export const handleMcpChat = async (req) => {
+     try {
+         const result = streamText({
+             // @ts-ignore - AI SDK type mismatch
+-            model: openrouter('google/gemini-3.0-flash'),
++            model: openrouter('google/gemini-3.1-flash-lite-preview'),
+             messages,
+             tools: activeTools,
+             system: `You are a helpful Payload CMS MCP Assistant orchestrating the local Mintel ecosystem.