https://gitlab.synchro.net/main/sbbs/-/commit/7f6db567f0f873b4c5a35bab
Added Files:
src/doors/clans-src/INSTALL
Log Message:
Add INSTALL file with build and packaging instructions

Provides standard build/install documentation for end users and packagers. Covers POSIX systems (Linux, BSD variants, macOS) and Windows.
Explains INSTALLDIR, PREFIX, and DESTDIR options for installation.
Includes Synchronet BBS example path.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

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