perf(plugin-sdk): narrow account-id export seam

Author: vincentkoc

src/plugin-sdk/account-id.ts

@@ -2,4 +2,4 @@ export {
   DEFAULT_ACCOUNT_ID,
   normalizeAccountId,
   normalizeOptionalAccountId,
-} from "../routing/session-key.js";
+} from "../routing/account-id.js";