fix: add BASE_PATH=/server/ to server-ui, remove strip prefix

Server-ui now handles base path natively via BASE_PATH env var.
Traefik forwards full path without stripping.

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

docker-compose.yml

@@ -200,13 +200,12 @@ 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: