Add http-referer header for vercel ai gateway requests (#1403)

packages/opencode/src/provider/provider.ts

@@ -194,6 +194,17 @@ export namespace Provider {
         },
       }
     },
+    vercel: async () => {
+      return {
+        autoload: false,
+        options: {
+          headers: {
+            "http-referer": "https://opencode.ai/",
+            "x-title": "opencode",
+          },
+        },
+      }
+    },
   }
 
   const state = App.state("provider", async () => {