WEB-648 refactor: replace magic numbers with LegalFormId enum (#3068)

src/app/clients/models/legal-form.enum.ts

@@ -0,0 +1,18 @@
+/**
+ * Copyright since 2025 Mifos Initiative
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * Legal Form IDs for client types.
+ * These represent the different legal forms a client can have.
+ */
+export enum LegalFormId {
+  /** Individual/Personal client */
+  PERSON = 1,
+  /** Non-person/Entity client (Organization, Corporation, etc.) */
+  ENTITY = 2
+}