Upgrade UI template tooling

[ruibaby]

Summary

• update the generated UI template to current Vue, Vite, Rsbuild, TypeScript, ESLint, Oxlint, Vitest, and related tooling versions
• align the linting, formatting, TypeScript, editor, and package metadata with the current create-vue starter
• add a shared Vitest configuration that supports Vue SFCs and Iconify imports in both Vite and Rsbuild projects
• document the Node.js requirement for generated UI projects

Motivation

Freshly generated Vite projects could not run ESLint because the TypeScript configuration loader dependency was missing.

Freshly generated Rsbuild projects could resolve an incompatible combination of Rsbuild 1 and @rsbuild/plugin-vue 2, causing the build to fail. Rsbuild projects also lacked the Vite plugins required to run Vue SFC unit tests.

This update fixes those failures while keeping the Halo-specific UI plugin entry and bundling behavior unchanged.

Testing

• pnpm check
• generated fresh Vite, Rsbuild, and backend-only projects
• ./gradlew build in generated Vite and Rsbuild projects
• pnpm build in generated Vite and Rsbuild UI projects
• pnpm lint in generated Vite and Rsbuild UI projects
• pnpm exec prettier --check src/
• verified a real Vue SFC unit test in both generated UI projects
• pnpm audit --json reported no known vulnerabilities
• npm pack --dry-run --json
• git diff --check

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