docs: panel guide + README refresh for multi-instance & cascade

- Add docs/panel-guide.md (features, troubleshooting, API table)
- README: intro, two AWG_PROFILES examples with pskPath, landing port note
- Bump package.json to 1.1.0; update verify grep for current UI

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -1,8 +1,8 @@
 {
   "name": "amnezia-admin",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "private": true,
-  "description": "Web-панель управления клиентами AmneziaWG (Docker, пароль, AWG)",
+  "description": "Web-панель AmneziaWG: несколько инстансов, WARP, каскад/Endpoint, экспорт .conf (Docker)",
   "license": "MIT",
   "repository": {
     "type": "git",