Introduce exit codes 232-238 for Tools & Addon scripts in misc/api.func and misc/error_handler.func. Update addon scripts (tools/addon/adguardhome-sync.sh, tools/addon/copyparty.sh, tools/addon/cronmaster.sh) to return specific codes instead of generic exit 1: 238 for unsupported OS and 233 when the application is not installed/upgrade prerequisites are missing. This makes failures more descriptive and aligns scripts with the central error explanations.
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