Add PHPUnit tests for dispPlusadCancel and matchWhitelist with CI pipeline

[Copilot]

PHPUnit test coverage for ad cancellation refund logic and URL whitelist matching, with GitHub Actions CI across PHP 7.4–8.5.

Test infrastructure

• tests/bootstrap.php — Rhymix CMS emulation layer: BaseObject, ModuleObject, Context::get/set, executeQuery, pointController::setPoint, pointModel, DB, moduleModel
• composer.json with phpunit/phpunit: ^9.6 || ^10.5 || ^11.0 for full PHP version range
• phpunit.xml minimal config compatible across PHPUnit 9/10/11

dispPlusadCancel tests (cancel_threshold=10%, cancel_fee=10%, ad_point=10000)

• Auth/ownership guards: no login, ad not found, wrong owner
• <0.5% elapsed → refund 9,000 pts (deduction: round(0.3%) + 10% fee = 10%)
• ~10% elapsed → refund 8,000 pts (deduction: round(9.99%) + 10% fee = 20%)
• 20% elapsed → rejected, no refund, no delete query fired

Uses large total duration (10M seconds) to make timing-sensitive assertions robust against wall-clock drift between setup and execution.

matchWhitelist tests

• Empty/null domain_list → regex /^$/, blocks all non-empty URLs
• Single domain → example.com allowed with any path, other domains rejected
• Two domains (\n-separated) → both allowed, others rejected
• Path-independent: domain determines match regardless of path/query/fragment
• \r\n line endings handled correctly

CI workflow (.github/workflows/ci.yml)

• Matrix: PHP 7.4, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5
• lint job: php -l syntax check on all non-vendor PHP files
• test job: composer install + vendor/bin/phpunit
• Explicit permissions: contents: read

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