Refactor Slack notifications and enhance departmental progress calculation

- Replace `send_webhook_message` with `send_message` for improved Slack notification rendering using `goals_progress_alert_renderer`.
- Add methods for calculating and retrieving departmental progress and distribution in `goals_criteria`.
- Update `renderDanishPeriodSummary` and Slack cron logic to support departmental-specific summaries.
- Include departmental progress in serialized goal objects for better reporting.

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

@@ -369,6 +369,15 @@ class goals_criteria implements goals_criteria_i
         return $criteria->getProgress();
     }
 
+    /**
+     * @throws \Exception
+     */
+    public static function calculateDepartmentalProgressFromArray(array $criteria_array): array
+    {
+        $criteria = self::fromJson(json_encode($criteria_array));
+        return $criteria->getDepartmentalProgress();
+    }
+
     /**
      * Export the criteria as an associative array suitable for JSON encoding.
      * Ensures a canonical schema matching fromJson expectations.
@@ -608,4 +617,28 @@ class goals_criteria implements goals_criteria_i
             }
         }
     }
+
+    /**
+     * @throws \Exception
+     */
+    private function getDepartmentalProgress(): array
+    {
+        $results = [];
+        $department_ids = $this->departments->listIDs();
+        foreach ($department_ids as $dept_id) {
+            $dept_criteria = clone $this;
+            $dept_criteria->departments->set([(new \objects\departments_o())->select($dept_id)]);
+            $results[$dept_id] = $dept_criteria->getProgress();
+        }
+        // reset the departments to original
+        $this->departments->set(array_map(fn($id) => (new \objects\departments_o())->select($id), $department_ids));
+        return $results;
+    }
+
+    public function withDepartmentFilter(int $department_id): goals_criteria
+    {
+        $new_criteria = clone $this;
+        $new_criteria->departments->set([(new \objects\departments_o())->select($department_id)]);
+        return $new_criteria;
+    }
 }