fix: use env var for Vite dev server host in Docker

- Make VITE_DEV_SERVER_HOST configurable via environment variable
- Pass 'vite' hostname to Django web service in docker-compose
- Remove unused env var from vite service
- Defaults to 'localhost' for non-Docker development

Author: CuriousLearner

template/config/settings/base.py.jinja

@@ -252,7 +252,7 @@ DJANGO_VITE = {
         "dev_mode": DEBUG,
         "manifest_path": BASE_DIR / "static" / "dist" / "manifest.json",
         "static_url_prefix": "dist/",
-        "dev_server_host": "localhost",
+        "dev_server_host": env("VITE_DEV_SERVER_HOST", default="localhost"),
         "dev_server_port": 5173,
     }
 }

template/docker-compose.yml.jinja

@@ -26,6 +26,9 @@ services:
       - EMAIL_PORT=1025
 {% if dependency_manager == 'uv' %}
       - UV_NO_CACHE=1
+{% endif %}
+{% if frontend_bundling == 'vite' %}
+      - VITE_DEV_SERVER_HOST=vite
 {% endif %}
     env_file:
       - .env
@@ -76,8 +79,6 @@ services:
     ports:
       - "5173:5173"
     command: sh -c "npm install && npm run dev"
-    environment:
-      - VITE_DEV_SERVER_HOST=0.0.0.0
 {% endif %}
 {% if background_tasks in ['temporal', 'both'] %}