Refactor Candidate and Quiz entities, rename Correction to QuizCandidate, and update related workflows

This commit removes nullable Uuid properties for consistency, transitions the Correction entity to QuizCandidate with associated migrations, refactors queries and repositories, adjusts related routes and controllers to use the new entity, updates front-end assets for elimination workflows, and standardizes route requirements and naming conventions.

migrations/Version20250606195952.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20250606195952 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql(<<<'SQL'
+            delete from given_answer where answer_id is null
+        SQL);
+        $this->addSql(<<<'SQL'
+            ALTER TABLE given_answer ALTER answer_id TYPE UUID
+        SQL);
+        $this->addSql(<<<'SQL'
+            ALTER TABLE given_answer ALTER answer_id SET NOT NULL
+        SQL);
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql(<<<'SQL'
+            ALTER TABLE given_answer ALTER answer_id TYPE UUID
+        SQL);
+        $this->addSql(<<<'SQL'
+            ALTER TABLE given_answer ALTER answer_id DROP NOT NULL
+        SQL);
+    }
+}