Add search functionality for user groups

Implemented `SearchUserGroupApiProvider` to handle user group search requests. Added `UserGroupRepository` and its interface to support search queries. Updated API specs to include user group as a searchable type.

src/Bundle/ChillMainBundle/Repository/UserGroupRepository.php

@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Repository;
+
+use Chill\MainBundle\Entity\UserGroup;
+use Chill\MainBundle\Search\SearchApiQuery;
+use Doctrine\ORM\EntityManagerInterface;
+use Doctrine\ORM\EntityRepository;
+
+final readonly class UserGroupRepository implements UserGroupRepositoryInterface
+{
+    private EntityRepository $repository;
+
+    public function __construct(EntityManagerInterface $em)
+    {
+        $this->repository = $em->getRepository(UserGroup::class);
+    }
+
+    public function find($id): ?UserGroup
+    {
+        return $this->repository->find($id);
+    }
+
+    public function findAll(): array
+    {
+        return $this->repository->findAll();
+    }
+
+    public function findBy(array $criteria, ?array $orderBy = null, ?int $limit = null, ?int $offset = null): array
+    {
+        return $this->repository->findBy($criteria, $orderBy, $limit, $offset);
+    }
+
+    public function findOneBy(array $criteria): ?UserGroup
+    {
+        return $this->repository->findOneBy($criteria);
+    }
+
+    public function getClassName(): string
+    {
+        return UserGroup::class;
+    }
+
+    public function provideSearchApiQuery(string $pattern, string $lang, string $selectKey = 'user-group'): SearchApiQuery
+    {
+        $query = new SearchApiQuery();
+        $query
+            ->setSelectKey($selectKey)
+            ->setSelectJsonbMetadata("jsonb_build_object('id', ug.id)")
+            ->setSelectPertinence('3 + SIMILARITY(LOWER(UNACCENT(?)), ug.label->>?) + CASE WHEN (EXISTS(SELECT 1 FROM unnest(string_to_array(label->>?, \' \')) AS t WHERE LOWER(t) LIKE \'%\' || LOWER(UNACCENT(?)) || \'%\')) THEN 100 ELSE 0 END', [$pattern, $lang, $lang, $pattern])
+            ->setFromClause('chill_main_user_group AS ug')
+            ->setWhereClauses('
+                SIMILARITY(LOWER(UNACCENT(?)), ug.label->>?) > 0.15
+                OR ug.label->>? LIKE \'%\' || LOWER(UNACCENT(?)) || \'%\'
+            ', [$pattern, $lang, $pattern, $lang]);
+
+        return $query;
+    }
+}