F2: Docker Build Verification
==============================
Command: docker build -f apps/server-core/Dockerfile -t nexusguard-server-core apps/server-core
Result: EXIT 0 (SUCCESS)
Date: 2026-05-25

Key steps from build output:
  #12 swag init generated:
      - docs/docs.go
      - docs/swagger.json
      - docs/swagger.yaml
  #14 go build completed (88.1s)
  #20 Image: nexusguard-server-core

Verified: swag init runs during Docker build before go build.
The fix resolves the original error: "no required module provides package .../docs"
