Fix: Refactor folder structure for consistency with dynamix plugins

[mstrhakr]

Pull request summary

Update all require_once, include, URL, and asset references to use the new directory names (include/ instead of php/, sheets/ instead of styles/) and PascalCase filenames.

Files updated:

• 14 PHP source files (require_once paths)
• 4 .page files (asset hrefs and include paths)
• 1 JS file (AJAX endpoint URLs)
• 1 shell script (inline PHP paths)
• 1 CSS file (comment reference)
• 3 build/test configs (phpstan, phpunit, bootstrap)
• 19 test files (include paths and docblock comments)
• 1 framework example test (asset path)

What changed:

• Refactored plugin path structure:
  • source/compose.manager/php/ → source/compose.manager/include/
  • source/compose.manager/styles/ → source/compose.manager/sheets/
• Renamed main PHP modules to PascalCase:
  • compose_manager_main.php → ComposeManager.php
  • compose_list.php → ComposeList.php
  • compose_util.php → ComposeUtil.php
  • compose_util_functions.php → Helpers.php
  • exec.php → Exec.php
  • exec_functions.php → ExecHelpers.php
  • others in include/ similarly
• Updated all references in .page template files to new assets and include URL paths
• Updated AJAX routes in source/compose.manager/javascript/common.js
• Updated shell script references in source/compose.manager/scripts/backup_cron.sh
• Built test harness compatibility:
  • phpstan.neon
  • phpunit.xml
  • tests/bootstrap.php (PluginBootstrap::init path/subPath)
• Updated unit tests and framework tests path references and comments
• test.ps1 execution passes with PHPUnit, PHPStan, Bats (skipped tests are known and unrelated to this refactor)

Related issues
Closes # (if applicable)

Checklist

• I have added/updated tests where applicable
• I have updated documentation (docs/, README, or plugin docs)
• Linted/formatted the code
• Verified on Unraid or CI

Testing notes
Run locally from repo root:

1. pwsh -NoProfile -ExecutionPolicy Bypass -File test.ps1
2. php vendor/bin/phpunit --configuration phpunit.xml
3. php vendor/bin/phpstan analyse --memory-limit=512M
4. bash tests/framework/bin/run-bats.sh tests/unit
5. verify no compose.manager/php or compose.manager/styles references:
   • grep -R "compose.manager/php" source/compose.manager
   • grep -R "compose.manager/styles" source/compose.manager

Notes

• No migration for user data required: this is internal path refactor.
• Backward compatibility:
  • plugin_root path remains /usr/local/emhttp/plugins/compose.manager/
  • old php/ and styles/ plugin URLs are intentionally replaced,
  • if a helper or external integration still hits old path, user upgrade script should update accordingly before release (i.e. shim or redirect in plugin patch if needed).
• Skipped tests are in BackupFunctions and expected by environment on a Windows CI host.