fix(docker): resolve @cc-platform/server file: dep in container build

Use additional_contexts to copy platform server package into the Docker
build context. Rewrites the file: dependency path and removes the
lockfile so npm install can resolve the local package correctly.
Applied to both production and dev Dockerfiles.

docker-compose.dev.yml

@@ -6,6 +6,8 @@ services:
     build:
       context: ./server
       dockerfile: Dockerfile.dev
+      additional_contexts:
+        platform-server: ../cc-platform-core/server
     container_name: turtle-server-dev
     ports:
       - "3001:3001"