feat(ui): style admin shell for retro theme and add prod docker config

- Update the retro theme CSS to style the dashboard, account, and admin pages with a classic Windows 98 aesthetic (silver sidebar, bevelled tabs, sunken metric cards).
- Exclude sidebar links and tabs from default retro link styles to ensure readability.
- Add `docker-compose-prod.yml` for production deployments.
- Add `.prod.env` to `.gitignore`.

docker-compose-prod.yml

@@ -0,0 +1,22 @@
+services:
+  app:
+    image: tea.chunkbyte.com/kato/warpbox-dev:latest
+    container_name: warpbox-dev
+    env_file:
+      - .prod.env
+    environment:
+      WARPBOX_ADDR: ":8080"
+      WARPBOX_DATA_DIR: /data
+      WARPBOX_STATIC_DIR: /app/static
+      WARPBOX_TEMPLATE_DIR: /app/templates
+    volumes:
+      - ./data:/data:Z
+    ports:
+      - "6070:8080"
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "wget -qO- http://127.0.0.1:8080/health >/dev/null || exit 1"]
+      interval: 30s
+      timeout: 3s
+      start_period: 10s
+      retries: 3