Resolve backend Qodana critical and high findings (#314)

Resolve recommended-profile Critical and High findings, retain narrow analyzer exceptions, and update the edge-broker WebSocket dependency to a non-vulnerable release.

services/nginx/app/classes/object_property.php

@@ -8,7 +8,6 @@ class object_property
     private string $table; // The id of the object in the database
     private string $column; // The column name of the field in the database table (e.g. id, name, email)
     private string $type; // The data type of the field in the database table (e.g. int, varchar, text)
-    private bool $required; // Whether the field is required or not
     private mixed $default; // The default value of the field
     private mixed $fake_value; // The fake value of the field, used for testing purposes (When the object id is -1)
 
@@ -18,7 +17,7 @@ class object_property
         $this->id = $id;
         $this->column = $column;
         $this->type = $type;
-        $this->required = $required;
+        unset($required); // Retained in the constructor for compatibility with existing object definitions.
         $this->default = $default;
     }