fix: reuse active Vite+ installations for exact versions

[fengmk2]

The action reuses a complete active installation for an exact version (0.3.0 or later), avoiding repeated downloads on persistent runners. Fixes #145.

flowchart LR
    A["Same exact version already installed"] -->|Before this PR| B["Download and reinstall"]
    A -->|With this PR| C{"Reuse checks pass?"}
    C -->|Yes| D["Reuse existing files<br/>No CLI download"]
    C -->|No| B
    B --> E["Apply inputs and continue setup"]
    D --> E
    classDef reuse fill:#dafbe1,stroke:#1a7f37,color:#1f2328
    classDef install fill:#fff1e5,stroke:#bc4c00,color:#1f2328
    class D reuse
    class B install

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For two setups of the same exact version, with a healthy retained installation and no management overrides:

Work	Before this PR	With this PR
Installer runs	2	1
CLI download during the second setup	Repeated	None
Active installation files during the second setup	Reinstalled	Unchanged

Reuse checks include the required native binding. Failed checks or environment overrides that require configuration changes use the installer. The action also adds fallback-bin to the end of PATH when present.

Tests cover reuse and binding repair on Linux, macOS, and Windows. Linux tests also cover restored installations and package-manager overrides. All 76 enabled CI jobs pass.

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Commit: d24cc30cd3bc3cedf1016c02600c946b15edbd0b
Suite: full · Vite+ version: latest

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