fix: use backend service name in Vite proxy target

Vite runs inside the frontend container where 'localhost' resolves to
the container itself, not the backend.  Change the /api proxy target
from http://localhost:8000 to http://backend:8000 so the request is
routed to the backend service over the compose network.

Docs/Tasks.md

@@ -4,7 +4,18 @@ This document breaks the entire BanGUI project into development stages, ordered
 
 ---
 
-## ✅ DONE — Issue: Setup forward
+## ✅ DONE — Issue: Vite proxy ECONNREFUSED
+
+**Problem:** The Vite dev server (running inside the frontend container) proxied
+`/api` to `http://localhost:8000`. Inside the container network `localhost`
+resolves to the container itself, not the backend service, causing
+`AggregateError [ECONNREFUSED]` for every API call.
+
+**Fix:** Changed `vite.config.ts` proxy target from `http://localhost:8000` to
+`http://backend:8000` so Vite uses the Docker/Podman compose service DNS name
+to reach the backend container over the shared network.
+
+---
 
 **Problem:** No DB present did not forward to setup page; setup page was not redirecting to login when already done.