feat(expenses): Add delete expense endpoint and functionality

Implements the ability to delete an expense, including its associated items and shares. Also refactors the expense update logic to correctly handle share updates and adds the corresponding API endpoint and mock DB function.

nginx.conf

@@ -1,38 +0,0 @@
-worker_processes 1;
-
-events { worker_connections 1024; }
-
-http {
-    include       mime.types;
-    default_type  application/octet-stream;
-    sendfile        on;
-    keepalive_timeout  65;
-
-    server {
-        listen 80;
-        root /usr/share/nginx/html;
-        index index.html;
-
-        # Limite upload per allegati (es. foto/video ticket) - Allineato con il backend
-        client_max_body_size 50M;
-
-        # Compressione Gzip
-        gzip on;
-        gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
-
-        # Gestione SPA (React Router)
-        location / {
-            try_files $uri $uri/ /index.html;
-        }
-
-        # Proxy API verso il backend
-        location /api/ {
-            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;
-        }
-    }
-}