fix(reconcile): preserve zero-replica services during hashing

[junhaoliao]

What I did

Prevent ServiceHash from mutating the caller's DeployConfig when excluding deploy.replicas from the service hash. This preserves deploy.replicas: 0 through reconciliation so docker compose up continues to skip zero-replica dependencies instead of waiting for a missing container.

Added a focused regression test that hashes a zero-replica dependency before running dependency-wait logic and verifies the dependency is still skipped.

Related issue

Fixes #13899.

Validation

gofmt -w pkg/compose/hash.go pkg/compose/convergence_test.go

No stdout/stderr.

go test ./pkg/compose -run 'TestServiceHash|TestWaitDependencies' -count=1

ok  	github.com/docker/compose/v5/pkg/compose	0.008s

go test ./pkg/compose -count=1

ok  	github.com/docker/compose/v5/pkg/compose	0.146s

go vet ./pkg/compose

No stdout/stderr.

go build -tags e2e -o /tmp/docker-compose-pr-build ./cmd

No stdout/stderr.

git diff --check

No stdout/stderr.