fix(plugin-sdk): remove remaining bundled plugin src imports (openclaw#39638)

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: Kyle <3477429+kyledh@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/plugin-sdk/nextcloud-talk.ts

@@ -73,6 +73,7 @@ export {
   readRequestBodyWithLimit,
   requestBodyErrorToText,
 } from "../infra/http-body.js";
+export { waitForAbortSignal } from "../infra/abort-signal.js";
 export { fetchWithSsrFGuard } from "../infra/net/fetch-guard.js";
 export { emptyPluginConfigSchema } from "../plugins/config-schema.js";
 export type { PluginRuntime } from "../plugins/runtime/types.js";