feat(cli): expose dependency alignment plans

[afonsojramos]

Summary

Vite+ releases can now tell external automation how to align Vite+, Vite+ core, Vitest, and official Vitest packages without reading or changing the project itself. This provides the release-owned compatibility contract needed to prevent dependency bots from producing mixed toolchains.

This is the first part of a three-repository integration. Containerbase installation and Renovate reconciliation follow after this contract ships in a Vite+ release.

Design

• vp sync-versions --plan-json accepts bounded manifest snapshots over stdin and returns deterministic before/after replacements.
• Planning updates only existing managed declarations. It preserves catalog protocols, JSON formatting, and YAML comments, quoting, indentation, and line endings.
• The command does not load project configuration, run installs or lifecycle scripts, format source, or write to the repository.
• Both the npm CLI and standalone archive expose the same protocol. Release archives include the self-contained planner, toolchain manifest, and checksums needed for verified installation.

Validation

• Planner, protocol, package-override, and migration suites: 395 tests passed.
• Focused sync-version suites: 39 tests passed.
• Global CLI Rust suite: 486 tests passed, 2 ignored.
• CLI TypeScript build, optimized Rust build, npm entrypoint smoke test, and standalone archive-layout simulation passed.
• Scoped formatting, lint, type checks, and git diff --check passed.

Related: #2356

Downstream drafts:

• feat(tools): install Vite+ releases containerbase/base#7338
• feat(vite-plus): align coupled package versions renovatebot/renovate#45630

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