fix(install): auto-create package.json when missing in vp install / vp add

[fengmk2]

Running vp install or vp add in a directory without package.json previously
failed with "Package not found in workspace". Now a minimal { "type": "module" }
package.json is created automatically, allowing PM detection and install to proceed.

[fengmk2]

• refactor(cli): rename vp env run to vp env exec #553
• feat(cli): fall back to package manager for vp run without vite-plus dependency #549
• feat(cli): add vp self-update command #548
• fix(install): auto-create package.json when missing in vp install / vp add #545 👈 (View in Graphite)
• feat(env): implement vp env command for Node.js version management #524 : 1 other dependent PR (#532 )
• feat(vp): refactor global cli to rust entry point #514
• feat(js_runtime): add multi-source Node version reading #522
• fix(build): run vite-plus-cli build after other packages #531
• main

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[fengmk2]

Merge activity

• Feb 7, 8:24 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Feb 7, 9:07 AM UTC: Graphite rebased this pull request as part of a merge.
• Feb 7, 9:25 AM UTC: @fengmk2 merged this pull request with Graphite.