fix: openresty fastcgi_params

[520svip]

Summary

• Added the missing SCRIPT_FILENAME fastcgi parameter to the fastcgi_params file of all four OpenResty versions (1.21.4.3, 1.27.1.2, 1.29.2.5, 1.31.1.1) so PHP-FPM can correctly locate the script to execute.
• Fixed apps/openresty/1.21.4.3-3-3-focal/conf/fastcgi_params, which was missing 6 parameters (HTTP_HOST, HTTP_USER_AGENT, HTTP_REFERER, HTTP_COOKIE, HTTP_X_FORWARDED_FOR, REQUEST_TIME) compared to the other three versions, making all four versions consistent.
• Changed the HTTP_HOST fastcgi parameter value from $http_host to $host in all four versions' fastcgi_params.

Validation

• Confirmed all four fastcgi_params files now contain the same set of parameters.
• Confirmed SCRIPT_FILENAME uses $document_root$fastcgi_script_name, so PHP requests resolve to the correct file.
• Confirmed HTTP_HOST is now $host across all four versions.

Notes

• SCRIPT_FILENAME is required by PHP-FPM; previously it only existed as a commented-out and incorrect line (/scripts$fastcgi_script_name) in build/nginx.vh.default.conf.
• The fastcgi-php.conf files were intentionally left unchanged; the parameter belongs in fastcgi_params.
• With HTTP_HOST set to $host, the port is omitted. This is fine for sites on standard ports (80/443), but non-standard ports (e.g. :8080) will not be reflected in the backend HTTP_HOST.