fix(cli): re-export vitest/config types (ViteUserConfig, etc.)

Task #56 narrowed `export * from 'vitest/config'` to an explicit list,
but missed the vitest-specific type aliases (ViteUserConfig,
ViteUserConfigExport, TestProjectConfiguration, TestUserConfig, etc.).
Downstream like vue-mini imports `ViteUserConfig` from 'vite-plus' and
broke with TS2724.

Add the full set of vitest-only type exports. Runtime exports
(mergeConfig, defineConfig, loadConfigFromFile) still come from
vite-plus-core only to avoid star-export conflicts.

Author: Brooooooklyn

packages/cli/src/index.ts

@@ -11,4 +11,20 @@ export {
   defineProject,
 } from 'vitest/config';
 
+export type {
+  TestProjectConfiguration,
+  TestProjectInlineConfiguration,
+  TestTagDefinition,
+  TestUserConfig,
+  UserProjectConfigExport,
+  UserProjectConfigFn,
+  UserWorkspaceConfig,
+  ViteUserConfig,
+  ViteUserConfigExport,
+  ViteUserConfigFn,
+  ViteUserConfigFnObject,
+  ViteUserConfigFnPromise,
+  WatcherTriggerPattern,
+} from 'vitest/config';
+
 export { defineConfig, lazyPlugins };