chore: delete unused util/network module (#27329)

packages/opencode/src/util/network.ts

@@ -1,9 +0,0 @@
-export function online() {
-  const nav = globalThis.navigator
-  if (!nav || typeof nav.onLine !== "boolean") return true
-  return nav.onLine
-}
-
-export function proxied() {
-  return !!(process.env.HTTP_PROXY || process.env.HTTPS_PROXY || process.env.http_proxy || process.env.https_proxy)
-}