chore: update copyright to 2026

[calsys456]

Update the copyright of the files that changed in
linuxdeepin/treeland-protocols#47

Happy new year

Summary by Sourcery

Chores:

• Standardize and refresh copyright notices in daemon components (display, Xorg, power, seat, virtual terminal, Treeland, and user session) to UnionTech Software with years updated through 2026.

[deepin-ci-robot]

Hi @calsys456. Thanks for your PR.

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[sourcery-ai]

Reviewer's Guide

This PR updates copyright headers across multiple daemon-related source and header files to attribute UnionTech Software Technology Co., Ltd. with extended years through 2026 while preserving existing third-party copyrights and license text.

File-Level Changes

Change	Details	Files
Standardize and update copyright headers to include UnionTech Software Technology Co., Ltd. through 2026 while keeping existing GPL licensing and original authorship.	Replace legacy top-of-file GPL comment blocks with versions that prepend a UnionTech Software Technology Co., Ltd. copyright line covering 2025-2026 or 2023-2026 as appropriate. Retain all existing individual contributor copyright lines and GPL-2.0-or-later boilerplate text unchanged in content. Update Treeland-related source/header files to use a UnionTech Software Technology Co., Ltd. copyright line instead of individual author names, with appropriate year ranges. Add a UnionTech Software Technology Co., Ltd. copyright line into UserSession files’ existing multi-line comment header without altering behavior or logic.	src/daemon/Display.cpp src/daemon/Display.h src/daemon/XorgDisplayServer.cpp src/daemon/XorgDisplayServer.h src/daemon/DaemonApp.cpp src/daemon/DaemonApp.h src/daemon/DisplayManager.cpp src/daemon/DisplayManager.h src/daemon/PowerManager.cpp src/daemon/PowerManager.h src/daemon/SeatManager.cpp src/daemon/SeatManager.h src/daemon/VirtualTerminal.cpp src/daemon/VirtualTerminal.h src/daemon/TreelandConnector.cpp src/daemon/TreelandConnector.h src/daemon/TreelandDisplayServer.cpp src/daemon/TreelandDisplayServer.h src/daemon/UserSession.cpp src/daemon/UserSession.h

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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: calsys456, zccrs

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