add getQueryParameter function

[simonLeary42]

PI search still works:

[Copilot]

Pull request overview

This PR introduces a new centralized getQueryParameter function in the UnityHTTPD class to standardize access to $_GET parameters across the codebase, replacing direct $_GET array access and manual validation checks with a consistent API.

• Added UnityHTTPD::getQueryParameter() method with optional parameter validation
• Refactored 6 PHP files to use the new function instead of direct $_GET access
• Corrected an unrelated method call from UnitySite::errorLog to UnityHTTPD::errorLog

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
resources/lib/UnityHTTPD.php	Adds new getQueryParameter() method to centralize $_GET parameter access with built-in validation
webroot/panel/modal/pi_search.php	Replaces direct $_GET["search"] access with getQueryParameter() call; corrects UnitySite::errorLog to UnityHTTPD::errorLog
webroot/panel/ajax/get_group_members.php	Replaces manual validation and $_GET["gid"] access with getQueryParameter() call
webroot/js/ajax/ssh_generate.php	Replaces optional $_GET["type"] check with getQueryParameter() using non-throwing parameter
webroot/api/content/index.php	Replaces manual validation for both line_wrap and content_name parameters with getQueryParameter() calls
webroot/admin/ajax/get_page_contents.php	Replaces manual validation and $_GET["pageid"] access with getQueryParameter() call
webroot/admin/ajax/get_group_members.php	Replaces manual validation and $_GET["gid"] access with getQueryParameter() call

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