docs: add auth portal usage guide

admin/Caddyfile

@@ -1,24 +1,34 @@
 {
   email dead@cxap.space
   dns cloudflare {$CF_API_TOKEN}
+  order authorize before reverse_proxy
   servers {
     trusted_proxies static private_ranges
   }
 }
 
-# общий сниппет авторизации
-(tinyauth_forwarder) {
-  forward_auth tinyauth:3000 {
-    uri /api/auth/caddy
-    copy_headers Remote-User Remote-Name Remote-Email Remote-Groups
+# Портал аутентификации
+auth.realy.nothing.help {
+  route {
+    authp {
+      backends {
+        local_backend {
+          method local
+          path /data/users.json
+        }
+      }
+      ui {
+        links {
+          "Portainer" "https://port.realy.nothing.help"
+        }
+      }
+    }
   }
 }
 
-# при желании — отдельный сниппет для API
-(tinyauth_api_forwarder) {
-  forward_auth tinyauth:3000 {
-    uri /api/auth/caddy
-    header_up Authorization {http.request.header.X-Api-Key}
-    header_up Accept application/json
+# Сниппет для защиты сервисов
+(auth_portal_forwarder) {
+  authorize {
+    set auth url https://auth.realy.nothing.help
   }
 }