[Web] move /process/login to internal endpoint

data/conf/nginx/mailcow_auth.conf

@@ -0,0 +1,23 @@
+server {
+  listen 9082 ssl http2;
+
+  ssl_certificate /etc/ssl/mail/cert.pem;
+  ssl_certificate_key /etc/ssl/mail/key.pem;
+
+  index mailcowauth.php;
+  server_name _;
+  error_log  /var/log/nginx/error.log;
+  access_log /var/log/nginx/access.log;
+  root /mailcowauth;
+  client_max_body_size 10M;
+
+  location ~ \.php$ {
+    client_max_body_size 10M;
+    try_files $uri =404;
+    fastcgi_split_path_info ^(.+\.php)(/.+)$;
+    fastcgi_pass phpfpm:9001;
+    include fastcgi_params;
+    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+    fastcgi_param PATH_INFO $fastcgi_path_info;
+  }
+}