Reorder COPY and RUN instructions in both Dockerfile and Dockerfile.server
to leverage Docker's layer caching for the dependency installation step.
Previously, pyproject.toml, README.md, and src/ were all copied together
before running uv pip install, meaning any source code change would
invalidate the dependency layer cache and force a full reinstall.
The new pattern copies only the dependency manifests (pyproject.toml and
uv.lock) first, installs the build tool in a cached layer, then copies
README.md and src/ for the actual wheel build. This ensures the
uv pip install step is only re-executed when pyproject.toml or uv.lock
change, not on every source code change.
ISSUES CLOSED: #1667
HAL9000