feat(logging): Implement database logging with app_log table

- Created migration to set up app_log table for storing application logs.
- Added AppLog entity and repository for ORM handling of logs.
- Developed DbLogger service to persist logs of level WARNING and above to the database while maintaining existing logging behavior.
- Implemented tests for admin log retrieval and DbLogger functionality to ensure proper logging behavior.
- Enhanced logging context sanitization for better error tracking.

tests/Admin/AdminLogsTest.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Tests\Admin;
+
+use App\Tests\ApiTestCase;
+
+/**
+ * GET /api/v1/admin/logs — admin-only, paginated, filterable by level.
+ */
+class AdminLogsTest extends ApiTestCase
+{
+    private function seedLog(string $level, string $message): void
+    {
+        $this->em->getConnection()->insert('app_log', [
+            'level'      => $level,
+            'message'    => $message,
+            'channel'    => 'app',
+            'path'       => '/test',
+            'created_at' => time(),
+        ]);
+    }
+
+    public function testNonAdminForbidden(): void
+    {
+        $user = $this->createUser(['ROLE_USER']);
+        $this->authJson('GET', '/api/v1/admin/logs', $user);
+        self::assertSame(403, $this->responseCode());
+    }
+
+    public function testAdminSeesLogsFilteredByLevel(): void
+    {
+        $marker = 'ADMINLOGTEST_' . bin2hex(random_bytes(5));
+        $this->seedLog('error', $marker . '_err');
+        $this->seedLog('warning', $marker . '_warn');
+
+        $admin = $this->createUser(['ROLE_ADMIN']);
+        $body  = $this->authJson('GET', '/api/v1/admin/logs?level=error&search=' . $marker, $admin);
+
+        self::assertSame(200, $this->responseCode());
+        self::assertTrue($body['success']);
+        self::assertCount(1, $body['data']);
+        self::assertSame('error', $body['data'][0]['level']);
+        self::assertSame($marker . '_err', $body['data'][0]['message']);
+        self::assertArrayHasKey('totalRecords', $body['meta']);
+
+        $this->em->getConnection()->executeStatement('DELETE FROM app_log WHERE message LIKE ?', [$marker . '%']);
+    }
+}

tests/Shared/DbLoggerTest.php

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+<?php
+
+namespace App\Tests\Shared;
+
+use Doctrine\DBAL\Connection;
+use Psr\Log\LoggerInterface;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+/**
+ * The `logger` service is decorated by App\Shared\Logging\DbLogger, which persists
+ * warning-and-above to the app_log table while leaving info/debug on stderr only.
+ */
+class DbLoggerTest extends KernelTestCase
+{
+    public function testWarningPersistedButInfoIsNot(): void
+    {
+        self::bootKernel();
+        $c = static::getContainer();
+        /** @var LoggerInterface $logger */
+        $logger = $c->get('logger');
+        /** @var Connection $conn */
+        $conn = $c->get('doctrine.dbal.default_connection');
+
+        $marker = 'DBLOGGER_TEST_' . bin2hex(random_bytes(5));
+
+        $logger->info($marker . '_info');
+        $logger->warning($marker . '_warn', ['exception' => new \RuntimeException('boom')]);
+
+        $warn = (int) $conn->fetchOne('SELECT COUNT(*) FROM app_log WHERE message = ?', [$marker . '_warn']);
+        $info = (int) $conn->fetchOne('SELECT COUNT(*) FROM app_log WHERE message = ?', [$marker . '_info']);
+
+        self::assertSame(1, $warn, 'warning must be persisted to app_log');
+        self::assertSame(0, $info, 'info must NOT be persisted to app_log');
+
+        // The Throwable in context is stored as a compact string, not a raw object.
+        $row = $conn->fetchAssociative('SELECT context, level, channel FROM app_log WHERE message = ?', [$marker . '_warn']);
+        self::assertSame('warning', $row['level']);
+        self::assertSame('app', $row['channel']);
+        self::assertStringContainsString('RuntimeException: boom', (string) $row['context']);
+
+        $conn->executeStatement('DELETE FROM app_log WHERE message LIKE ?', [$marker . '%']);
+    }
+}