Rename the web app from FatihsMG4 to Nils' MG4

Browser title, login heading, hidden password-manager username, session
cookie (nilsmg4_session) and package name. The README keeps the credit
to fatihdonmezdev/FatihsMG4. Server version 1.1.1; the manifests pin it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QLJfZQZeAKAwSqViTmLzki

web/package.json

@@ -1,6 +1,6 @@
 {
-  "name": "fatihsmg4-web",
-  "version": "1.1.0",
+  "name": "nilsmg4-web",
+  "version": "1.1.1",
   "private": true,
   "scripts": {
     "dev": "next dev",