fix(install): use managed npm for global commands

[lyzno1]

Summary

• Use the resolved managed npm binary for global add/remove/update/outdated commands when the adjacent npm is executable.
• Fall back to npm on PATH when the adjacent managed npm is missing or not executable, with debug logging for diagnostics.
• Keep existing vite_install APIs compatible by falling back to npm when no explicit binary is provided.
• Add coverage for absolute binary resolution and managed npm fallback behavior.

Why

Global npm commands previously depended on PATH being prepared by the caller. This makes the managed npm path explicit when it is safe to do so, while preserving PATH-based fallback for system runtimes and unchanged command arguments.

Tests

• cargo test -p vite_command --no-fail-fast
• cargo test -p vite_install --no-fail-fast
• cargo test -p vite_global_cli --no-fail-fast

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[lyzno1]

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[lyzno1]

@codex review

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