feat: add new ALTCHA challenge endpoint to HTTP API routes

Author: Ivan

meshchatx.rsm

@@ -44,6 +44,10 @@
             "method": "POST",
             "path": "/api/v1/app/tutorial/seen"
         },
+        {
+            "method": "GET",
+            "path": "/api/v1/auth/altcha/challenge"
+        },
         {
             "method": "GET",
             "path": "/api/v1/auth/csrf"