fix: serve SPA from apps/web/dist (matches server default) + use Datum IP

Two production-blocker bugs from the first deploy:

1. Static SPA never served — Dockerfile copied apps/web/dist into
   apps/api/public, but server.ts default static dir resolves to
   apps/web/dist. Mismatch meant every route fell through to Express'
   bare 404 ("Cannot GET /"). Aligning Dockerfile to the default path.

2. DNS for the Datum container name failed (getaddrinfo ENOTFOUND
   datum_datum_1) — gashboard's Docker DNS doesn't reliably alias
   external-network container names across compose stacks. Switch the
   default DATUM_URL to the container's known IP on umbrel_main_network
   (10.21.0.11, captured during earlier diagnostics). If the IP changes
   the user can override DATUM_URL in env. If gashboard isn't actually
   joined to umbrel_main_network, the next failure will be a much more
   diagnostic ECONNREFUSED instead of an opaque ENOTFOUND.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.env.example

@@ -16,7 +16,7 @@ LOG_LEVEL=info
 # Reachable internally inside Umbrel's docker network. From your LAN it's also
 # at http://192.168.1.191:21000 but that path goes through umbrelOS auth.
 # Inside the Umbrel docker network, use the Datum service hostname directly.
-DATUM_URL=http://datum_datum_1:21000
+DATUM_URL=http://10.21.0.11:21000
 DATUM_ADMIN_USER=admin
 DATUM_ADMIN_PASSWORD=
 # How often to scrape /clients (ms). Datum updates per-worker hashrate every

Dockerfile

@@ -37,7 +37,7 @@ COPY apps/api/package.json apps/api/
 RUN pnpm install --filter @gashboard/api --prod --frozen-lockfile
 
 COPY --from=build-api /app/apps/api/dist apps/api/dist
-COPY --from=build-web /app/apps/web/dist apps/api/public
+COPY --from=build-web /app/apps/web/dist apps/web/dist
 
 USER node
 EXPOSE 1337

docker-compose.yml

@@ -20,7 +20,10 @@ services:
       PORT: "1337"
       LOG_LEVEL: "${LOG_LEVEL:-info}"
       CORS_ORIGIN: "${CORS_ORIGIN:-}"
-      DATUM_URL: "${DATUM_URL:-http://datum_datum_1:21000}"
+      # Direct container IP from umbrel_main_network. Bypasses Docker DNS
+      # (which doesn't reliably alias container names across stacks). If your
+      # Datum container moves to a different IP, override DATUM_URL in env.
+      DATUM_URL: "${DATUM_URL:-http://10.21.0.11:21000}"
       DATUM_ADMIN_USER: "${DATUM_ADMIN_USER:-admin}"
       DATUM_ADMIN_PASSWORD: "${DATUM_ADMIN_PASSWORD?must be set}"
       DATUM_POLL_INTERVAL_MS: "${DATUM_POLL_INTERVAL_MS:-5000}"