Add email tracking, CSP reporting, security controllers and services

- EmailTracking entity + repository + pixel tracking controller
- CspReportController: filter noise, alert on real violations
- RedirectController: external redirect warning page
- UnsubscribeManager: HMAC-based unsubscribe with hashed storage
- MailerService: rewrite with S/MIME, tracking, unsubscribe headers
- ViteAssetExtension: add nonce CSP via Nelmio, isMobile
- composer: add stripe/stripe-php, mobiledetect
- Templates: add home/index, update base.html.twig with vite_asset
- Email template: rebrand to E-Ticket

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

composer.json

@@ -15,9 +15,11 @@
         "league/flysystem-aws-s3-v3": "^3.32",
         "league/flysystem-bundle": "^3.6",
         "liip/imagine-bundle": "^2.17",
+        "mobiledetect/mobiledetectlib": "*",
         "nelmio/security-bundle": "^3.9",
         "phpdocumentor/reflection-docblock": "^6.0",
         "phpstan/phpdoc-parser": "^2.3",
+        "stripe/stripe-php": "*",
         "symfony/asset": "8.0.*",
         "symfony/console": "8.0.*",
         "symfony/doctrine-messenger": "8.0.*",