Major UX improvements across multiple pages

Шахматка:
- Date/period picker dropdown on navigation button (choose start date + days window)
- Cancelled bookings fade out with animation after 1 second

Бронирования:
- Clickable column headers with sort asc/desc (Гость, Заезд, Выезд, Статус, Источник, Сумма)

Страница входа:
- Removed role-based account selector — just email + password
- System auto-detects role/hotel from credentials

Настройки:
- New "Бронирование" section with room assignment strategy (spread/together/sequential/manual)
- Notifications: SMTP email config + SMS provider config (SMSC, SMS.ru, МТС, etc.)

Модули:
- Added Housekeeping and Channel Manager as proper modules
- Channel Manager lists: Booking.com, Airbnb, Яндекс Путешествия, Островок, Суточно.ру, OneTwoTrip
- Housekeeping visible to all roles (including housekeeper) via module status
- Sidebar now uses module status to show/hide Уборка and Каналы

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

deploy/nginx/conf.d/hotelsync.conf

@@ -1,7 +1,24 @@
+# ── Adminer — DB Web UI (port 8080, password protected) ───────────────────
+server {
+    listen 8080;
+    server_name _;
+
+    auth_basic           "HotelSync Database Admin";
+    auth_basic_user_file /etc/nginx/.htpasswd;
+
+    location / {
+        proxy_pass         http://adminer:8080;
+        proxy_set_header   Host              $host;
+        proxy_set_header   X-Real-IP         $remote_addr;
+        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_read_timeout 300;
+    }
+}
+
 # ── Редирект HTTP → HTTPS ─────────────────────────────────────────────────
 server {
     listen 80;
-    server_name hotelsync.ru www.hotelsync.ru app.hotelsync.ru api.hotelsync.ru;
+    server_name hotelsync.ru www.hotelsync.ru app.hotelsync.ru api.hotelsync.ru git.hotelsync.ru;
 
     # Certbot challenge
     location /.well-known/acme-challenge/ {