add a GUI standalone app

[3nids]

This is basically the main functionnality from the QGIS plugin

[Copilot]

Pull request overview

This pull request adds a standalone GUI application for managing PostgreSQL connection service files, porting functionality from the existing QGIS plugin to work as a standalone application.

Changes:

• Adds PyQt6-based GUI with service list, settings editor, and file management capabilities
• Introduces service settings definitions with widget type metadata for GUI rendering
• Implements Qt compatibility layer to support both QGIS plugin and standalone usage

Reviewed changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
pyproject.toml	Adds gui optional dependency (PyQt6) and console script entry point
pgserviceparser/service_settings.py	Defines PostgreSQL service settings with metadata for GUI editors including widget types and validation
pgserviceparser/gui/init.py	GUI module initialization with Qt import
pgserviceparser/gui/main.py	Entry point for standalone GUI application
pgserviceparser/gui/compat.py	Qt compatibility shim supporting both qgis.PyQt and PyQt6
pgserviceparser/gui/main_window.py	Main application window wrapper
pgserviceparser/gui/setting_model.py	Qt model for service configuration table with dirty tracking
pgserviceparser/gui/item_delegates.py	Custom delegates for password, file, and combobox editors
pgserviceparser/gui/service_widget.py	Main widget for listing, creating, editing, and removing services

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