Add phpstan level 7(#544)

app/SSH/Services/Database/Database.php

@@ -3,8 +3,9 @@
 namespace App\SSH\Services\Database;
 
 use App\Models\BackupFile;
+use App\SSH\Services\ServiceInterface;
 
-interface Database
+interface Database extends ServiceInterface
 {
     public function create(string $name, string $charset, string $collation): void;
 
@@ -14,6 +15,9 @@ public function createUser(string $username, string $password, string $host): vo
 
     public function deleteUser(string $username, string $host): void;
 
+    /**
+     * @param  array<string>  $databases
+     */
     public function link(string $username, string $host, array $databases): void;
 
     public function unlink(string $username, string $host): void;