refactor(upgrade): migrate upgrade framework to namespaced classes with DI

[mambax7]

Complete the upgrade framework modernization that was partially started
with the scanner classes. Migrates the three core classes from legacy
flat files to PSR-4 namespaced structure, adds a proper autoloader, and
updates every upd_*/index.php to use constructor dependency injection.

Framework changes:

• class/abstract.php → class/Xoops/Upgrade/XoopsUpgrade.php
• class/control.php → class/Xoops/Upgrade/UpgradeControl.php
• class/patchstatus.php → class/Xoops/Upgrade/PatchStatus.php
• class/autoload.php (new) PSR-4 autoloader for Xoops\Upgrade
• class/fatal_error_handler.php (new) centralized fatal error capture

Every upd_*/index.php file updated to:

• use Xoops\Upgrade\XoopsUpgrade; use Xoops\Upgrade\UpgradeControl;
• public function __construct(XoopsMySQLDatabase $db, UpgradeControl $control)
• parent::__construct($db, $control, basename(DIR))

upd_2.5.11-to-2.7.0/index.php gains 6 new upgrade tasks:

• widenconfid — config.conf_id + configoption.conf_id smallint → int
• widenimagename — image.image_name varchar(30) → varchar(191)
• cleanuplibraries — delete obsolete build artifacts from class/libraries/
• deletetinymce5nested — delete duplicate tinymce5/tinymce5/ nested directory
• deleteflashsanitizer — delete obsolete Flash text sanitizer plugin
• cleancache — clear compiled templates and cache files

upgrade_tpl.php refactored to use a $viewModel array for cleaner
separation between the upgrade controller and its template rendering.

Tested end-to-end by running the upgrade wizard from a fresh XOOPS 2.5.11
install through to 2.7.0 RC1, including the System module update step
that seeds menus. All upgrade tasks completed successfully.

Summary by CodeRabbit

• New Features

  • Template-driven upgrade UI, autoloading for upgrade components, centralized upgrade queue, multi-language support discovery, and a global fatal-error reporter.

• Bug Fixes

  • Safer database interactions and result validation, hardened path/language includes, atomic license-file writes, improved login/error reporting, safer unserialization and file operations.

• Refactor

  • Modernized upgrade framework with dependency injection, typed upgrade modules, clearer orchestration, safer file deletion and improved logging.