Drop HOST_PORT env override, hardcode 8080

Unnecessary flexibility — port doesn't need to be configurable.

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

docker-compose.yml

@@ -7,7 +7,7 @@ services:
     image: gitea.honeyy.duckdns.org/website/honey-links:latest
     build: .
     ports:
-      - "${HOST_PORT:-8080}:80"
+      - "8080:80"
     environment:
       - ADMIN_PASSWORD=${ADMIN_PASSWORD}
       - SECRET_KEY=${SECRET_KEY}