chore(frontend): upgrade vite-plus to 0.2.1

[fengmk2]

Upgrades the frontend toolchain from vite-plus 0.1.x to 0.2.1.

v0.2.1's one breaking change is that it consumes upstream Vitest directly: the @voidzero-dev/vite-plus-test wrapper is removed and vitest now comes in transitively through vite-plus.

What changed in frontend/package.json:

• vite-plus: 0.1.24 -> 0.2.1
• vitest: dropped the @voidzero-dev/vite-plus-test@0.1.24 alias and pinned upstream vitest@4.1.9 (the version bundled with vite-plus 0.2.1), since the frontend imports directly from vitest. Also removed the now-dangling vitest override.
• vite: kept the npm:@voidzero-dev/vite-plus-core override (still required) and bumped it (and the devDependency alias) to 0.2.1.

The dependency tree resolves to a single vitest@4.1.9 (no duplicate copies), and no reference to @voidzero-dev/vite-plus-test remains. Imports from vite-plus/test were left unchanged.

Reviewers: frontend/package.json is the substantive change; the lockfile is regenerated.

[gemini-code-assist]

Code Review

This pull request updates the frontend dependencies in package.json and package-lock.json. Specifically, vite and vite-plus are upgraded to version 0.2.1, and vitest is migrated from the custom @voidzero-dev/vite-plus-test package to the standard 4.1.9 release. Additionally, the vitest override has been removed, and several new testing-related packages (such as @vitest/browser, @vitest/expect, and @testing-library/user-event) have been introduced. There are no review comments to address, and I have no further feedback to provide.

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