chore: upgrade vite-plus to v0.2.0 (#829)

Upgrade the toolchain from vite-plus v0.1.24 to v0.2.0.

v0.2.0 has two relevant breaking changes:
1. It consumes upstream Vitest directly, removing the
`@voidzero-dev/vite-plus-test` wrapper; `vitest` now arrives
transitively through `vite-plus`.
2. It raises the minimum Node.js to `^22.18.0 || >=24.11.0`.

## Changes
- `vite-plus`: `^0.1.24` -> `^0.2.0`
- `vite` override: bumped to `npm:@voidzero-dev/vite-plus-core@^0.2.0`
(still required), in both `package.json` and `pnpm-workspace.yaml`
- `vitest`: dropped the `@voidzero-dev/vite-plus-test` alias, pinned to
upstream `4.1.9` (the version bundled with vite-plus 0.2.0)
- `@vitest/coverage-v8`: `^4.1.8` -> `4.1.9` (this project uses the
coverage provider directly, so it is pinned to the single vitest
version)
- Removed the now-obsolete `vitest` override and its
`peerDependencyRules.allowAny` entry in `pnpm-workspace.yaml`

`engines.node` was left at `>= 22.19.0` since it already excludes Node
below 22.18.0.

## Verification
- No `@voidzero-dev/vite-plus-test` references remain outside
`node_modules`.
- Dependency tree resolves to a single `vitest@4.1.9` and
`@vitest/coverage-v8@4.1.9`.
- `vp test run`: native Vitest banner `RUN v4.1.9`, 229 passed / 6
skipped, 0 failures.
- `vp check`: format, lint, and type checks all pass.

Author: fengmk2

package.json

@@ -89,7 +89,7 @@
     "@types/selfsigned": "^2.1.0",
     "@types/tar-stream": "^2.2.3",
     "@typescript/native-preview": "beta",
-    "@vitest/coverage-v8": "^4.1.8",
+    "@vitest/coverage-v8": "4.1.9",
     "busboy": "^1.6.0",
     "cross-env": "^10.1.0",
     "iconv-lite": "^0.7.0",
@@ -99,9 +99,9 @@
     "tshy": "^4.0.0",
     "tshy-after": "^1.4.1",
     "typescript": "^6.0.0",
-    "vite": "npm:@voidzero-dev/vite-plus-core@^0.1.24",
-    "vite-plus": "^0.1.24",
-    "vitest": "npm:@voidzero-dev/vite-plus-test@^0.1.24"
+    "vite": "npm:@voidzero-dev/vite-plus-core@^0.2.0",
+    "vite-plus": "^0.2.0",
+    "vitest": "4.1.9"
   },
   "tshy": {
     "exports": {