* fix(fleet): resolve getSenchoVersion crash in Docker containers
Replace the runtime __dirname walk (which fails in Docker because the
root package.json is absent from the final image) with a build-time
version injection. A prebuild script reads the root package.json and
generates src/generated/version.ts with the version baked in as a
constant. The compiled output carries the correct version regardless
of the container's filesystem layout.
Retains a filesystem walk fallback for dev environments where the
prebuild hook may not have run.
* fix(fleet): skip postinstall version generation when script is absent
The Docker prod-deps stage copies only package.json (no source files)
before running npm ci --omit=dev. The postinstall hook now checks for
the script file before executing, so it no-ops in stages where
scripts/generate-version.js has not been copied.
Anso