Update file permissions and enhance error handling in login template and setup scripts

api/setup/save.php

@@ -29,6 +29,14 @@ if (is_file(APP_PATH . "database.db")) {
     ]);
 }
 
+// Check PDO drivers
+if (!extension_loaded("pdo_sqlite") || !extension_loaded("sqlite3")) {
+    $api->answer(500, [
+        "error" => "missing_drives",
+        "error_text" => "Please install the extensions pdo_sqlite and sqlite3."
+    ]);
+}
+
 $username = $input["username"];
 $password = $input["password"];
 $password_repeat = $input["password_repeat"];