add version to user-agent

packages/opencode/src/provider/models.ts

@@ -3,6 +3,7 @@ import { Log } from "../util/log"
 import path from "path"
 import { z } from "zod"
 import { data } from "./models-macro" with { type: "macro" }
+import { Installation } from "../installation"
 
 export namespace ModelsDev {
   const log = Log.create({ service: "models.dev" })
@@ -63,7 +64,7 @@ export namespace ModelsDev {
     log.info("refreshing")
     const result = await fetch("https://models.dev/api.json", {
       headers: {
-        "User-Agent": "opencode",
+        "User-Agent": Installation.USER_AGENT,
       },
     }).catch(() => {})
     if (result && result.ok) await Bun.write(file, result)