Fix GrampsWeb production config: restart policy + sync to nginx sub_filter approach (STI-91)

- compose.yml: add restart: unless-stopped to grampsweb (production resilience)
- docker-compose.prod.yml: remove stale container-patching, align to nginx sub_filter
  approach (STI-98/102); update GRAMPSWEB_BASE_URL default to full URL

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

compose.yml

@@ -190,6 +190,7 @@ services:
 
   grampsweb:
     image: ghcr.io/gramps-project/grampsweb:latest
+    restart: unless-stopped
     ports:
       - "8090:5000"
     environment: