Append /api/ to dev apiUrl so client requests match controller routes

The Blazor client builds endpoints as relative URIs (e.g. "Registration/Login")
against the configured apiUrl. Other environments end apiUrl with "/api/";
the Development value was missing it, so requests resolved to /Registration/Login
instead of /api/Registration/Login and got a 404.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: slang25

PocketDDD.BlazorClient/PocketDDD.BlazorClient/wwwroot/appsettings.Development.json

@@ -1,4 +1,4 @@
 {
-  "apiUrl": "https://localhost:7081",
+  "apiUrl": "https://localhost:7081/api/",
   "fakeBackend": false
 }