Fix redirect loop by setting NEXT_PUBLIC_ENTE_ALBUMS_ENDPOINT

The app was redirecting to /shared-albums because albumsAppOrigin()
returned the same host as the current URL after runtime replacement.
By setting NEXT_PUBLIC_ENTE_ALBUMS_ENDPOINT at build time to a
placeholder and replacing it at runtime with the full path-based URL,
the host comparison will fail and prevent the redirect loop.

Version bump to 0.3.1

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

start.sh

@@ -398,6 +398,7 @@ if [ -d "$WEB_RUNTIME_DIR" ]; then
   log INFO "Rewriting frontend endpoints for local deployment"
   FRONTEND_REPLACEMENTS=(
     "ENTE_API_ORIGIN_PLACEHOLDER|$API_ORIGIN"
+    "ENTE_ALBUMS_ORIGIN_PLACEHOLDER|$BASE_URL/albums"
     "https://api.ente.io|$API_ORIGIN"
     "https://accounts.ente.io|$BASE_URL/accounts"
     "https://auth.ente.io|$BASE_URL/auth"