ci: standardize workflows and updater tag handling

[Yisus-Develop]

Summary

• add PHP Quality workflow (blocking php lint + non-blocking PHPCS report)
• add Release Plugin ZIP workflow for tag-based releases (v*)
• normalize updater version handling for GitHub tags with v prefix
• add GitHub API User-Agent header for updater request stability
• align updater repo reference to Yisus-Develop/EWEB-Gallery-Suite

Why

This keeps the plugin aligned with the EWEB release/update standard and avoids update version mismatches when releases use tags like v1.4.3.

Validation

• local php -l passed for all PHP files
• branch pushed without modifying main

Notes

• no functional feature changes in gallery behavior
• only CI/release/update pipeline hardening

[gemini-code-assist]

Code Review

This pull request updates the GitHub updater to handle version tags prefixed with 'v' or 'V', corrects the repository slug casing, and adds a User-Agent header to API requests. Feedback focuses on hardening the code against missing tag_name properties in the GitHub API response to prevent PHP 8.1+ warnings when calling ltrim.

[gemini-code-assist]

The GitHub API may return an error response (e.g., due to rate limiting or a missing repository) as a valid JSON object that lacks the tag_name property. Accessing $remote->tag_name without verification will trigger a PHP warning in PHP 8.1+, where passing null to ltrim is deprecated. It is safer to verify the property exists before processing. Additionally, normalizing the version string once in a variable improves code clarity.

			if ( $remote && isset( $remote->tag_name ) && version_compare( $local_data['Version'], $new_version = ltrim( $remote->tag_name, 'vV' ), '<' ) ) {
				$obj = new stdClass();
				$obj->slug = dirname( $this->plugin_slug );
				$obj->new_version = $new_version;

[gemini-code-assist]

To prevent PHP warnings when the GitHub API response is unexpected or missing the tag_name property, use the null coalescing operator to provide a safe fallback for the ltrim function. This ensures compatibility with PHP 8.1+.

			$res->version = ltrim( $remote->tag_name ?? '', 'vV' );