Scaffold weather app: reception forecast display + shared internal API

- Backend: Fastify service polling Met Office DataHub (Global Spot: hourly,
  three-hourly, daily endpoints) with Open-Meteo fallback, hourly refresh.
  Reuses settings' hotel_location/met_office integrations (same pattern as
  hvac's lib/weather.js) rather than its own credential copy.
- Three display tiers stored in one forecast_points table: today (hourly),
  next 2 days (3-hourly), days 4-7 (plain daily) - 7 days total.
- Public /api/public/forecast (no auth) feeds the reception kiosk display;
  /api/internal/forecast (WEATHER_SECRET bearer) lets other apps read the
  stored forecast instead of polling providers themselves; /api/admin/*
  (normal JWT + settings cap) is the staff status/refresh page.
- Frontend: root / is the public full-screen Display (no AuthGate at all -
  first genuinely public app in the stack); /admin is the authed status
  page. apps.base_path is /weather/admin so the portal card opens the
  admin view directly, precedented by forecasting's history sub-route.
- LXC 131 / 10.10.10.131, registered in auth/src/db.js, push-to-forgejo.sh,
  and stack-init/install-stack.sh (deploy_weather + --only dispatch + full
  install chain).
- Typechecks and builds clean; not yet deployed.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/nginx.conf

@@ -0,0 +1,40 @@
+server {
+    listen 80;
+    server_name localhost;
+    root /usr/share/nginx/html;
+    client_max_body_size 12m;
+
+    location /weather/api/auth/ {
+        proxy_pass http://10.10.10.101:3001/api/auth/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    }
+
+    location /weather/api/ {
+        proxy_pass http://backend:3001/api/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        add_header Cache-Control "no-store";
+    }
+
+    location /weather/health {
+        proxy_pass http://backend:3001/health;
+    }
+
+    location ~* /weather/.*\.(js|css|png|ico|svg|woff2?)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+        try_files $uri =404;
+    }
+
+    location /weather/ {
+        add_header Cache-Control "no-cache" always;
+        try_files $uri /weather/index.html;
+    }
+
+    location = / {
+        return 301 /weather/;
+    }
+}