fix: Remove phone from required fields in contact controller

Phone was incorrectly required in the controller validation
even though schema and database allow null.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/controllers/personal-contact.controller.js

@@ -23,8 +23,8 @@ export const listPersonalContacts = async (req, res, next) => {
 export const createPersonalContact = async (req, res, next) => {
   try {
     const payload = normalizePayload(req.body)
-    if (!payload.firstName || !payload.phone || !payload.email) {
-      throw new BadRequestError('firstName, phone a email sú povinné')
+    if (!payload.firstName || !payload.email) {
+      throw new BadRequestError('firstName a email sú povinné')
     }
 
     const created = await personalContactService.createPersonalContact(req.userId, payload)