Add Asset Management app

Assets from purchase invoice lines, straight-line depreciation/amortization with salvage value, disposals, and [Asset Mgmt] sources in Batch GL Entries. Green third workspace with an app access guard.

app/asset/api/engine/remove_category.php

@@ -0,0 +1,15 @@
+<?php
+session_start();
+require_once '../../../assets/utils/db_auth.php';
+require_app_access('asset');
+require_role($user_role, ['owner', 'admin']);
+require_once '../../../assets/utils/classes_as/AssetCategoryManager.php';
+
+$id = (int)($data['id'] ?? 0);
+if (!$id) { $answer['message'] = 'Missing id'; exit(json_encode($answer)); }
+
+(new AssetCategoryManager($pdo2, $company_id))->deactivate($id);
+
+$answer['success'] = 1;
+$answer['message'] = 'Category deactivated.';
+exit(json_encode($answer));