Removed go.sum from the COPY cache layer — go mod download -x creates it when absent. Added empty backend/go.sum for local tooling (gopls, go build). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Removed go.sum from the COPY cache layer — go mod download -x creates it when absent. Added empty backend/go.sum for local tooling (gopls, go build). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>