fix(plane): add WEB_URL and NEXT_PUBLIC_API_BASE_URL to plane-web container

Without these env vars Next.js SSR renders with wrong base URL causing
React hydration error #418 — server/client HTML mismatch on first render.

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

roles/services/templates/docker-compose.yml.j2

@@ -154,6 +154,9 @@ services:
     restart: unless-stopped
     depends_on:
       - plane-api
+    environment:
+      - WEB_URL=https://{{ domain_plane }}
+      - NEXT_PUBLIC_API_BASE_URL=https://{{ domain_plane }}
     networks:
       - backend
       - plane-internal