Add department_goals_o object and enhance JSON export for goals module

- Introduce `department_goals_o` for managing department-specific goals with criteria.
- Enhance `goals_criteria` with `toArray` and `toJson` methods for canonical JSON export.
- Update `goals` to delegate JSON export to `goals_criteria`.

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

@@ -131,4 +131,41 @@ class goals_criteria implements goals_criteria_i
 
         return $criteria;
     }
+
+    /**
+     * Export the criteria as an associative array suitable for JSON encoding.
+     * Ensures a canonical schema matching fromJson expectations.
+     * @return array
+     */
+    public function toArray(): array
+    {
+        // Normalize lists to identifiers only
+        $users = $this->users?->listCustomerNumbers() ?? [];
+        $departments = $this->departments?->listIDs() ?? [];
+        $products = $this->products?->listIDs() ?? [];
+
+        // Remove nulls and duplicates just in case
+        $users = array_values(array_unique(array_filter($users, fn($v) => $v !== null)));
+        $departments = array_values(array_unique(array_filter($departments, fn($v) => $v !== null)));
+        $products = array_values(array_unique(array_filter($products, fn($v) => $v !== null)));
+
+        return [
+            'type' => $this->type?->name ?? goals_criteria_type::NONE->name,
+            'target' => $this->target ?? 0,
+            'start' => ($this->start instanceof \DateTimeInterface) ? $this->start->format(DATE_ATOM) : null,
+            'end' => ($this->end instanceof \DateTimeInterface) ? $this->end->format(DATE_ATOM) : null,
+            'users' => $users,
+            'departments' => $departments,
+            'products' => $products,
+        ];
+    }
+
+    /**
+     * Export the criteria to JSON
+     * @return string
+     */
+    public function toJson(): string
+    {
+        return json_encode($this->toArray());
+    }
 }