fix: cdn.hotelsync.ru nginx config + RoomModal key for state reset

- Add cdn.hotelsync.ru server block to nginx config (serves /var/www/uploads)
- Add cdn.hotelsync.ru to HTTP redirect server_name
- RoomModal: add key={editingRoom?.id ?? 'new'} to force state reinit on room change
- RoomModal: remove categories[0] fallback for categoryId (show 'Без категории' instead)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nginx/conf.d/hotelsync.conf

@@ -1,7 +1,7 @@
 # ── Редирект HTTP → HTTPS ─────────────────────────────────────────────────
 server {
     listen 80;
-    server_name hotelsync.ru www.hotelsync.ru app.hotelsync.ru api.hotelsync.ru git.hotelsync.ru guest.hotelsync.ru cp.hotelsync.ru;
+    server_name hotelsync.ru www.hotelsync.ru app.hotelsync.ru api.hotelsync.ru git.hotelsync.ru guest.hotelsync.ru cp.hotelsync.ru cdn.hotelsync.ru;
 
     location /.well-known/acme-challenge/ {
         root /var/www/certbot;
@@ -115,6 +115,25 @@ server {
     }
 }
 
+# ── cdn.hotelsync.ru — Static file CDN (uploads) ─────────────────────────
+server {
+    listen 443 ssl;
+    server_name cdn.hotelsync.ru;
+
+    ssl_certificate     /etc/letsencrypt/live/cdn.hotelsync.ru/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/cdn.hotelsync.ru/privkey.pem;
+    ssl_protocols TLSv1.2 TLSv1.3;
+    ssl_ciphers HIGH:!aNULL:!MD5;
+
+    add_header Access-Control-Allow-Origin '*' always;
+    add_header Cache-Control 'public, max-age=31536000, immutable' always;
+
+    location / {
+        root /var/www/uploads;
+        try_files $uri =404;
+    }
+}
+
 # ── git.hotelsync.ru — Gitea ──────────────────────────────────────────────
 server {
     listen 443 ssl;