<IfModule mod_rewrite.c>
    RewriteEngine On

    # Installer (with or without trailing slash)
    RewriteRule ^install/?$ install/index.php [L,QSA]
    RewriteRule ^install/(.*)$ install/$1 [L,QSA]

    # Laravel API / admin (if front controller is wired later)
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^ index.php [L,QSA]
</IfModule>

DirectoryIndex index.php
