fix(opencode): pass configured headers to Copilot models (#32815)

packages/opencode/src/plugin/github-copilot/copilot.ts

@@ -70,6 +70,7 @@ export async function CopilotAuthPlugin(input: PluginInput): Promise<Hooks> {
         return CopilotModels.get(
           base(auth.enterpriseUrl),
           {
+            ...(provider.options?.headers as Record<string, string> | undefined),
             Authorization: `Bearer ${auth.refresh}`,
             "User-Agent": `opencode/${InstallationVersion}`,
             "X-GitHub-Api-Version": API_VERSION,