refactor: rename recipients route to people, update all frontend references

tests/unit/app/assignments/assignment-form-pages.test.ts

@@ -23,8 +23,8 @@ vi.mock("@/i18n/server", () => ({
   getI18n: mocks.getI18n,
 }))
 
-vi.mock("@/services/recipient.service", () => ({
-  RecipientService: {
+vi.mock("@/services/person.service", () => ({
+  PersonService: {
     findAll: mocks.findAllRecipients,
   },
 }))