feat(cli): warn when project-local CLI is missing

[liangmiQwQ]

Close #2361

This PR warns when vp delegates inside a project without a resolvable project-local vite-plus, while preserving the global CLI fallback.

• If the project declares a vite-plus dependency, prompt the user to run vp install.
• If the project does not declare a vite-plus dependency, direct the user to the migration guide.
• If vp migrate is run, do not warn because it is the remediation path.
• If the command runs outside a project, keep the existing silent fallback.

The vp exec RFC now distinguishes local-to-global CLI fallback from remote fallback for the command being executed.

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[liangmiQwQ]

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[fengmk2]

I recall a previous scenario where a project does not deps on vite-plus, but it uses the global vp CLI to install project dependencies.
Currently, would it be unreasonable for a prompt to appear in this situation?

[liangmiQwQ]

@fengmk2 Direct vp install runs won't be delegated to local cli (as well as other PM commands), so they will not be affected here.