Add JSON import/export functionality for goals module

- Implement `exportToJson` and `importFromJson` methods in `goals` for serialization and deserialization.
- Add `fromJson` method in `goals_criteria` to parse criteria from JSON input.
- Extend `exampleRoute` for debugging with sample JSON-based goal creation.
- Update `index.php` to autoload new `goals` module classes and dependencies.

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

@@ -43,6 +43,31 @@ class goals_criteria implements goals_criteria_i
         $this->products = new goals_criteria_products();
         $this->start = new \DateTime();
         $this->end = new \DateTime();
+
     }
 
+    /**
+     * @throws \Exception If the JSON is invalid
+     */
+    public static function fromJson(string $json): goals_criteria
+    {
+        $data = json_decode($json, true);
+        $criteria = new goals_criteria();
+
+        if (isset($data['type'])) {
+            $criteria->type = goals_criteria_type::tryFrom($data['type']);
+        }
+        if (isset($data['target'])) {
+            $criteria->target = $data['target'];
+        }
+        if (isset($data['start'])) {
+            $criteria->start = new \DateTime($data['start']);
+        }
+        if (isset($data['end'])) {
+            $criteria->end = new \DateTime($data['end']);
+        }
+        // Additional parsing for users, departments, products can be added here
+
+        return $criteria;
+    }
 }