chore(configs): migrate oxlint→eslint presets, refactor tsconfig

- Replace @robonen/oxlint with @robonen/eslint (composable ESLint flat-config
  presets: base, typescript, vue, vitest, imports, node, stylistic).
- Plugins bundled as deps: typescript-eslint, eslint-plugin-vue,
  @vitest/eslint-plugin, eslint-plugin-import-x, eslint-plugin-n,
  eslint-plugin-unicorn, @stylistic/eslint-plugin.
- @robonen/tsconfig: add base/dom/node/vue configs for composite project refs.

configs/eslint/src/index.ts

@@ -0,0 +1,13 @@
+/* Compose */
+export { compose } from './compose';
+
+/* Presets */
+export { base, ignores, typescript, vue, vitest, imports, node, stylistic } from './presets';
+
+/* Types */
+export type {
+  FlatConfig,
+  FlatConfigArray,
+  FlatConfigInput,
+  Rules,
+} from './types';