fix: remove root redirect, /platform/ is the entry point

Server-side path rewrite breaks React Router (browser URL stays at /
but basename is /platform). The SPA entry point is /platform/ — users
bookmark that. Root / goes to Logto catch-all which is correct for
direct OIDC flows.

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

docker-compose.yml

@@ -147,14 +147,6 @@ services:
       - traefik.http.routers.saas.entrypoints=websecure
       - traefik.http.routers.saas.tls=true
       - traefik.http.services.saas.loadbalancer.server.port=8080
-      - traefik.http.routers.root-redirect.rule=Path(`/`)
-      - traefik.http.routers.root-redirect.priority=100
-      - traefik.http.routers.root-redirect.entrypoints=websecure
-      - traefik.http.routers.root-redirect.tls=true
-      - traefik.http.routers.root-redirect.middlewares=root-to-platform
-      - traefik.http.routers.root-redirect.service=saas
-      - traefik.http.middlewares.root-to-platform.replacepathregex.regex=^/$$
-      - traefik.http.middlewares.root-to-platform.replacepathregex.replacement=/platform/
     networks:
       - cameleer