Fix Docker networking: migrate API from host to bridge network

[Copilot]

The API service was using network_mode: host while nginx used bridge networking, preventing container name resolution and inter-service communication.

Changes:

• docker-compose.yml

  • Remove network_mode: host from API service
  • Add API service to buildup-network bridge network
  • Bind API to 0.0.0.0 instead of 127.0.0.1
  • Add port mapping 8080:8080

• nginx/default.conf

  • Update proxy_pass to use container name: http://api:8080 instead of http://127.0.0.1:8080
  • Applied to both /api/ and /ws/ locations

This enables Docker DNS-based service discovery between nginx and API containers.

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