fix: respect project paths and Vite+ build commands

[hyoban]

Description

Resolve Oxc config reads and editor targets from the project context so nested projects use their own files when the process starts elsewhere.

Use vp build for Rolldown analysis when Vite+ is installed, sharing the existing Vite+ detection through the kit.

Linked Issues

None.

Additional context

Adds regression coverage for nested project configs, editor paths, and build command selection, and updates the kit export snapshots.

Validation: pnpm lint, pnpm test --run (334 passed, 2 skipped), pnpm typecheck, and pnpm build passed.

[pkg-pr-new]

Open in StackBlitz

@vitejs/devtools

npm i https://pkg.pr.new/@vitejs/devtools@581

@vitejs/devtools-kit

npm i https://pkg.pr.new/@vitejs/devtools-kit@581

@vitejs/devtools-oxc

npm i https://pkg.pr.new/@vitejs/devtools-oxc@581

@vitejs/devtools-rolldown

npm i https://pkg.pr.new/@vitejs/devtools-rolldown@581

@vitejs/devtools-vite

npm i https://pkg.pr.new/@vitejs/devtools-vite@581

@vitejs/devtools-vitest

npm i https://pkg.pr.new/@vitejs/devtools-vitest@581

commit: 18927cd