feat: Introduce multi-condo management and notices

This commit refactors the application to support managing multiple condominiums.

Key changes include:
- Introduction of `Condo` and `Notice` data types.
- Implementation of multi-condo selection and management, including active condo context.
- Addition of a notice system to inform users about important updates or events within a condo.
- Styling adjustments to ensure better visibility of form elements.
- Mock database updates to accommodate new entities and features.

nginx.conf

@@ -1,27 +1 @@
-server {
-    listen 80;
-
-    # Serve i file statici del frontend (React build)
-    location / {
-        root /usr/share/nginx/html;
-        index index.html index.htm;
-        # Importante per React Router: se non trova il file, serve index.html
-        try_files $uri $uri/ /index.html;
-    }
-
-    # Proxy per le chiamate API verso il container del backend
-    location /api {
-        # 'backend' è il nome del servizio definito nel docker-compose.yml
-        proxy_pass http://backend:3001;
-        proxy_http_version 1.1;
-        proxy_set_header Upgrade $http_upgrade;
-        proxy_set_header Connection 'upgrade';
-        proxy_set_header Host $host;
-        proxy_cache_bypass $http_upgrade;
-    }
-
-    error_page 500 502 503 504 /50x.html;
-    location = /50x.html {
-        root /usr/share/nginx/html;
-    }
-}
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