feat(modules): pause background threads when display is asleep

Currently, modules polling hardware nodes continuously wake up kernel drivers even when the monitor is asleep (e.g., DPMS off), flooding dmesg.

- Adds 'disable-on-sleep' config flag
- Hooks GTK window map/unmap signals to track DPMS state
- Propagates suspend/resume calls to AModule worker threads

include/modules/temperature.hpp

@@ -14,6 +14,8 @@ class Temperature : public ALabel {
   Temperature(const std::string&, const Json::Value&);
   virtual ~Temperature() = default;
   auto update() -> void override;
+  void suspend() override;
+  void resume() override;
 
  private:
   float getTemperature();