fix(cli): use dynamic import variable to avoid tsc resolution of optional @objectstack/service-i18n

The CLI package uses tsc (not tsup) for building, so a static string
literal in `import('@objectstack/service-i18n')` causes TS2307 because
the package isn't in CLI's dependencies. Using a variable indirection
prevents tsc from attempting module resolution at compile time.

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/cli/src/commands/serve.ts

@@ -220,7 +220,9 @@ export default class Serve extends Command {
       );
       if (!hasI18nPlugin && configHasTranslations) {
         try {
-          const { I18nServicePlugin } = await import('@objectstack/service-i18n');
+          // Dynamic import with variable to prevent tsc from resolving the optional package
+          const i18nPkg = '@objectstack/service-i18n';
+          const { I18nServicePlugin } = await import(/* webpackIgnore: true */ i18nPkg);
           const i18nCfg = config.i18n || config.manifest?.i18n || {};
           await kernel.use(new I18nServicePlugin({
             defaultLocale: i18nCfg.defaultLocale,