fix: declare Vue as a peer dependency

[xianzuyang9-blip]

Summary

• add vue to peerDependencies for the published library package
• keep vue in devDependencies for local builds and type checks

The library imports from vue, and the Vite library build already externalizes vue, so consumers should receive an explicit peer dependency declaration.

Verification

• npx pnpm@8.15.9 install --frozen-lockfile
• npx pnpm@8.15.9 run build:lib
• npx pnpm@8.15.9 pack --pack-destination C:\tmp\vue-command-palette
• verified the packed package/package.json includes peerDependencies.vue

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