feat: initial creation of deb package

[cmatsuoka]

Create control and data tarballs and archive them in a .deb file.
Filename is currently based on the main project name and will be
adjusted to use the correct package name after the project model
is in place. Control metadata and checksum files will be added
in a separate PR.

Fixes #37

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DEBCRAFT-17

[Copilot]

Pull Request Overview

This PR implements the initial functionality for creating Debian (.deb) packages using zstandard compression. The implementation creates control and data tarballs and archives them into a .deb file format, though metadata and checksums will be added in a future PR.

Key changes:

• Added zstandard library as a new dependency for efficient compression
• Replaced simple tar.xz packaging with proper .deb file creation using ar archives
• Implemented separate creation of control.tar.zstd and data.tar.zstd files

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 6 comments.

File	Description
pyproject.toml	Adds zstandard>=0.25.0 as a project dependency
uv.lock	Updates lock file with zstandard package metadata and wheel distributions for multiple platforms
debcraft/services/package.py	Implements .deb package creation with zstandard-compressed control and data archives, including new helper functions for creating each tarball

Comments suppressed due to low confidence (1)

debcraft/services/package.py:23

• Import of 'shutil' is not used.

import shutil

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