Add port 8122 for reverse proxy, fix buildx cache, update docs

- Map host 8122 to api container for reverse proxy at momswap.produktor.duckdns.org
- Remove buildx cache_from/cache_to to allow docker build on default driver
- Document reverse proxy setup in frontend integration guide
- Update README with port mapping notes
- bun.lock: add deps from bun install for geo-api-client

Made-with: Cursor

docker-compose.yml

@@ -21,10 +21,6 @@ services:
       context: .
       dockerfile: Dockerfile
       target: runtime
-      cache_from:
-        - type=local,src=.docker/buildx-cache
-      cache_to:
-        - type=local,dest=.docker/buildx-cache,mode=max
     image: momswap-backend:latest
     container_name: momswap-backend-api
     environment:
@@ -44,10 +40,6 @@ services:
       context: .
       dockerfile: Dockerfile
       target: dev
-      cache_from:
-        - type=local,src=.docker/buildx-cache
-      cache_to:
-        - type=local,dest=.docker/buildx-cache,mode=max
     image: momswap-backend:dev
     container_name: momswap-backend-api-dev
     environment: