Introduce modular goal criteria system for users, departments, and products

- Add `goals_criteria` base class implementing customizable goal criteria.
- Introduce interfaces and traits for modular handling of users, departments, and products in goal criteria.
- Include enumeration for goal types (`goals_criteria_type`).
- Implement timeframe and target management through traits.
- Provide initial configuration for enabling the goals module.

services/nginx/app/modules/goals/classes/goals_criteria.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace goals\classes;
+
+use goals\helpers\goals_criteria_type;
+use goals\interfaces\goals_criteria_i;
+use goals\traits\goals_result_parser_t;
+use goals\traits\goals_target_t;
+use goals\traits\goals_timeframe_t;
+
+class goals_criteria implements goals_criteria_i
+{
+    use goals_timeframe_t,
+        goals_target_t,
+        goals_result_parser_t;
+    /**
+     * The users criteria
+     * @var goals_criteria_users $users
+     */
+    public goals_criteria_users $users;
+    /**
+     * The departments criteria
+     * @var goals_criteria_departments $departments
+     */
+    public goals_criteria_departments $departments;
+    /**
+     * Criteria type (products sold, etc.)
+     * @var goals_criteria_type $type
+     */
+    public goals_criteria_type $type = goals_criteria_type::NONE;
+    /**
+     * Products criteria
+     * @var goals_criteria_products|null $products
+     */
+    public ?goals_criteria_products $products;
+    /**
+     * Constructor
+     */
+    public function __construct()
+    {
+        $this->users = new goals_criteria_users();
+        $this->departments = new goals_criteria_departments();
+        $this->products = new goals_criteria_products();
+    }
+
+}