feat: fix backend SQL columns, add dark/light theme, fix legacy CSS

- Fix 7 backend controllers: rename columns to match actual DB schema
  (name_room→room_number, id_room→id, bed_type→room_type,
   id_employee→id, status_employee→status)
- Fix 10 frontend files with matching property renames
- Add ThemeContext with dark/light toggle (localStorage persisted)
- Redesign theme.css with [data-theme] attribute selectors
- Add Google Fonts (Syne, DM Sans, JetBrains Mono)
- Redesign sidebar, topbar, and login page CSS
- Migrate ~44 legacy CSS files from hardcoded colors to CSS variables
- Remove Dashboards/Tableros section from menu
- Clean up commented-out CSS blocks across codebase

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

docker-compose.yml

@@ -36,7 +36,7 @@ services:
       EMAIL_PORT: 587
       EMAIL_USER: ${EMAIL_USER}
       EMAIL_PASS: ${EMAIL_PASS}
-      URL_CORS: https://hotel.consultoria-as.com
+      URL_CORS: http://192.168.10.229:5172
       BANXICO_TOKEN: ${BANXICO_TOKEN}
     depends_on:
       postgres:
@@ -49,7 +49,7 @@ services:
     ports:
       - "5172:5172"
     environment:
-      VITE_API_BASE_URL: http://backend:4000/api
+      VITE_API_BASE_URL: http://192.168.10.229:4000/api
     depends_on:
       - backend