6654: Fix Symfony 8 deprecations and broken routing resources

- Migrate Serializer\Annotation to Serializer\Attribute namespace (9 entities)
- Remove eraseCredentials() from User and Server (removed from UserInterface)
- Set explicit default_protocol on UrlType (default changed to null)
- Fix routing resources from .xml to .php (framework, web_profiler)

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

Author: turegjorup

composer.json

@@ -15,32 +15,32 @@
         "doctrine/orm": "^3.0",
         "easycorp/easyadmin-bundle": "^5.0",
         "itk-dev/openid-connect-bundle": "^4.0",
-        "itk-dev/vault-bundle": "^0.1.0",
+        "itk-dev/vault-bundle": "^1.0.0",
         "nelmio/cors-bundle": "^2.2",
         "ocramius/doctrine-batch-utils": "^2.8",
         "phpstan/phpdoc-parser": "^2.0",
-        "symfony/amqp-messenger": "^7.2",
-        "symfony/asset": "^7.2",
-        "symfony/browser-kit": "^7.2",
-        "symfony/console": "^7.2",
-        "symfony/doctrine-messenger": "^7.2",
-        "symfony/dotenv": "^7.2",
-        "symfony/expression-language": "^7.2",
+        "symfony/amqp-messenger": "^8.0",
+        "symfony/asset": "^8.0",
+        "symfony/browser-kit": "^8.0",
+        "symfony/console": "^8.0",
+        "symfony/doctrine-messenger": "^8.0",
+        "symfony/dotenv": "^8.0",
+        "symfony/expression-language": "^8.0",
         "symfony/flex": "^2",
-        "symfony/framework-bundle": "^7.2",
-        "symfony/http-client": "^7.2",
-        "symfony/messenger": "^7.2",
-        "symfony/monolog-bundle": "^3.0",
-        "symfony/property-access": "^7.2",
-        "symfony/property-info": "^7.2",
-        "symfony/runtime": "^7.2",
-        "symfony/security-bundle": "^7.2",
-        "symfony/serializer": "^7.2",
-        "symfony/twig-bundle": "^7.2",
-        "symfony/uid": "^7.2",
-        "symfony/validator": "^7.2",
+        "symfony/framework-bundle": "^8.0",
+        "symfony/http-client": "^8.0",
+        "symfony/messenger": "^8.0",
+        "symfony/monolog-bundle": "^4.0",
+        "symfony/property-access": "^8.0",
+        "symfony/property-info": "^8.0",
+        "symfony/runtime": "^8.0",
+        "symfony/security-bundle": "^8.0",
+        "symfony/serializer": "^8.0",
+        "symfony/twig-bundle": "^8.0",
+        "symfony/uid": "^8.0",
+        "symfony/validator": "^8.0",
         "symfony/webpack-encore-bundle": "^2.0",
-        "symfony/yaml": "^7.2"
+        "symfony/yaml": "^8.0"
     },
     "require-dev": {
         "ergebnis/composer-normalize": "^2.23",
@@ -54,12 +54,12 @@
         "phpstan/phpstan-symfony": "^2.0",
         "phpunit/phpunit": "^13.0",
         "rector/rector": "^2.0",
-        "symfony/css-selector": "^7.2",
-        "symfony/debug-bundle": "^7.2",
+        "symfony/css-selector": "^8.0",
+        "symfony/debug-bundle": "^8.0",
         "symfony/maker-bundle": "^1.37",
-        "symfony/stopwatch": "^7.2",
-        "symfony/var-dumper": "^7.2",
-        "symfony/web-profiler-bundle": "^7.2"
+        "symfony/stopwatch": "^8.0",
+        "symfony/var-dumper": "^8.0",
+        "symfony/web-profiler-bundle": "^8.0"
     },
     "replace": {
         "symfony/polyfill-ctype": "*",
@@ -98,7 +98,7 @@
     "extra": {
         "symfony": {
             "allow-contrib": false,
-            "require": "7.4.*"
+            "require": "8.0.*"
         }
     },
     "scripts": {