fix(ente,garmin-grafana): resolve port conflict and credential piping

Ente: Remove circular Caddy :8080 reverse_proxy block that conflicted
with Museum binding to the same port. Museum serves directly on 8080.

Garmin-Grafana: Use GARMINCONNECT_EMAIL and GARMINCONNECT_BASE64_PASSWORD
env vars instead of broken heredoc stdin piping through timeout+uv run.
MFA code piped via stdin only when provided.

install/ente-install.sh

@@ -289,16 +289,6 @@ cat <<EOF >/etc/caddy/Caddyfile
     }
 }
 
-# Museum API Proxy
-:8080 {
-    reverse_proxy localhost:8080
-
-    header {
-        Access-Control-Allow-Origin *
-        Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS"
-        Access-Control-Allow-Headers *
-    }
-}
 EOF
 systemctl reload caddy
 msg_ok "Configured Caddy"