Fix container startup: plain HTTP behind reverse proxy

- Caddyfile: disable auto_https and admin, listen on :80 only
- docker-compose: bind port only on 127.0.0.1 to avoid public exposure
- bootstrap/app.php: trust all proxies so Laravel generates correct URLs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -3,7 +3,7 @@ services:
     build: .
     restart: unless-stopped
     ports:
-      - "5000:80"
+      - "127.0.0.1:5000:80"
     environment:
       SERVER_NAME: ":80"
       APP_ENV: "${APP_ENV:-production}"