fix: restore BASE_PATH=/server, remove strip-prefix

Server-ui needs BASE_PATH for React Router basename. Without strip-prefix,
no X-Forwarded-Prefix doubling. Server-ui handles full /server/ path itself.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -197,13 +197,12 @@ services:
         condition: service_healthy
     environment:
       CAMELEER_API_URL: http://cameleer3-server:8081
+      BASE_PATH: /server
     labels:
       - traefik.enable=true
       - traefik.http.routers.server-ui.rule=PathPrefix(`/server`)
       - traefik.http.routers.server-ui.entrypoints=websecure
       - traefik.http.routers.server-ui.tls=true
-      - traefik.http.routers.server-ui.middlewares=server-ui-strip
-      - traefik.http.middlewares.server-ui-strip.stripprefix.prefixes=/server
       - traefik.http.routers.server-ui.service=server-ui
       - traefik.http.services.server-ui.loadbalancer.server.port=80
     networks: