Fix power profile synchronization and add one-click scripts

[Ishtiaqe]

This PR improves power profile synchronization, resolves the startup/close overwrite issues, and simplifies the build and installation process with top-level scripts.

Changes:

1. Robust D-Bus Property Access:

   • Refactored queryPowerProfile() and queryChargerState() in PowerMonitor to use Qt's native iface.property() instead of raw D-Bus Get calls.
   • Handled variant unpacking (adding .canConvert<QDBusVariant>() checks) to ensure compatibility on different D-Bus architectures.

2. Wildcard Signal Connections:

   • Updated D-Bus property signal connections to match any sender (passing "" service name wildcard), resolving signal delivery failures caused by unique name or alias resolution mismatches.

3. Low-power Mode Mappings Conflict Resolution:

   • In on_PowerProfileChange, if the reported system profile is PowerSaver, it keeps either Silent or Super Battery mode if the hardware is already configured in one of those low-power modes, preventing the UI from overriding the user's manual preference.

4. Startup Overwrite Prevention:

   • Modified loadSettings() in Operate to check if autoPPD or autoAcDc are enabled on startup. If auto-profiles are active, it skips applying the saved "UserMode" to the EC, allowing the system's power state to be checked and synchronized bidirectionally on launch.

5. Top-level One-click Installer and Uninstaller:

   • Added install.sh and uninstall.sh at the repository root to clean, build, and deploy all binary components, system D-Bus configurations, and shortcuts in a single step.