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>

symfony.lock

@@ -87,6 +87,15 @@
             "bin/phpunit"
         ]
     },
+    "stripe/stripe-php": {
+        "version": "19.4",
+        "recipe": {
+            "repo": "github.com/symfony/recipes-contrib",
+            "branch": "main",
+            "version": "19.0",
+            "ref": "d6829c693e3927a8972c7671d74a1a5c505712b0"
+        }
+    },
     "symfony/console": {
         "version": "8.0",
         "recipe": {