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Add scripts/ci/test.sh <server|client>: server runs `go test ./...` inside golang:1.25 (mirrors ci.yml's go-server job docker invocation + gomod/gobuild caches + GOPROXY from _env.sh); client runs `flutter test` inside ghcr.io/cirruslabs/flutter:stable (mirrors ci.yml's flutter-client job's pub-cache mount + test dirs). Wired into deploy-server.yml's Test step already added in Task 4. Registers the script in ci.yml's shellcheck file list. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013nMthbVEmQquxBRKb9Fj8u