Release 0.1.9

[wachawo]

No description provided.

[Copilot]

Pull Request Overview

This PR implements release 0.1.9 with a significant architectural refactoring of LanCalc. The primary focus is on modularizing the codebase into distinct CLI and GUI components while adding external IP detection capabilities.

Key changes include:

• Modular architecture separating core logic, CLI, GUI, and external adapters
• Added external IP detection with new -e/--external CLI flag
• Refactored package structure with optional GUI dependencies

Reviewed Changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test_lancalc.py	Updated test structure to work with new modular architecture and added network interface detection tests
pytest.ini	Added qt_api marker configuration for PyQt5 tests
pyproject.toml	Updated dependencies to make PyQt5 required and added nogui optional dependency group
lancalc/main.py	Converted to adaptive launcher that detects environment and chooses CLI/GUI mode
lancalc/gui.py	New module containing GUI functionality extracted from main.py
lancalc/core.py	New module with pure business logic for network calculations
lancalc/cli.py	New module handling command-line interface with external IP support
lancalc/adapters.py	New module for external system interactions and network detection
lancalc/main.py	Added module entry point for python -m lancalc usage
lancalc/init.py	Updated to export new modular structure

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