chore: add .gitignore for C++ and Qt artifacts

[add-uos]

Added a .gitignore file to exclude common C++ object files, Qt build artifacts, and QtCreator-specific configurations. This prevents generated files and local IDE settings from being accidentally committed to the repository.

Summary by Sourcery

Build:

• Add .gitignore entries to exclude common C++ object files, Qt build artifacts, and QtCreator-specific configuration files from version control.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

.gitignore file added to exclude common C++ compilation outputs and Qt/QtCreator build artifacts from version control.

File-Level Changes

Change	Details	Files
Introduce a .gitignore configuration to keep generated C++ and Qt build/IDE artifacts out of the repository.	Add patterns to ignore typical C/C++ compilation outputs such as object files and libraries. Add patterns to ignore Qt build directories and generated UI/meta-object files. Add patterns to ignore QtCreator-specific project and user configuration files.	.gitignore

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: add-uos, lzwind

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

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Approvers can cancel approval by writing /approve cancel in a comment

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: add-uos, lzwind

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[add-uos]

/merge