Switch domain to warehack.ing, add prod/dev .env.example

Dev: heltec-tracker.l.warehack.ing
Prod: heltec-tracker.warehack.ing

SITE_URL is now env-driven so the same image builds correct
canonical URLs for both environments.

site/.env.example

@@ -0,0 +1,14 @@
+# Docker Compose project name
+COMPOSE_PROJECT=heltec-tracker-docs
+
+# --- Development (local) ---
+# MODE=development
+# DOMAIN=heltec-tracker.l.warehack.ing
+# VITE_HMR_HOST=heltec-tracker.l.warehack.ing
+# PORT=4321
+
+# --- Production ---
+MODE=production
+DOMAIN=heltec-tracker.warehack.ing
+SITE_URL=https://heltec-tracker.warehack.ing
+PORT=80

site/astro.config.mjs

@@ -4,7 +4,7 @@ import starlight from '@astrojs/starlight';
 
 // https://astro.build/config
 export default defineConfig({
-	site: 'https://heltec-tracker-module.l.zmesh.systems',
+	site: process.env.SITE_URL || 'https://heltec-tracker.warehack.ing',
 
 	// Disable telemetry
 	telemetry: false,

site/docker-compose.yml

@@ -8,11 +8,12 @@ services:
     environment:
       - ASTRO_TELEMETRY_DISABLED=1
       - VITE_HMR_HOST=${VITE_HMR_HOST:-}
+      - SITE_URL=${SITE_URL:-}
     networks:
       - caddy
     labels:
       # Caddy reverse proxy configuration
-      caddy: ${DOMAIN:-heltec-tracker-module.l.zmesh.systems}
+      caddy: ${DOMAIN:-heltec-tracker.l.warehack.ing}
       caddy.reverse_proxy: "{{upstreams ${PORT:-4321}}}"
       # HMR WebSocket support for dev mode
       caddy.reverse_proxy.flush_interval: "-1"