refactor(services): split screen capture into screenshot + recorder services

Split the monolithic ScreenCapture service into focused Screenshot and
ScreenRecorder services behind a pluggable capture backend.

- Add shared/capture.py: CaptureBackend abstraction + HyprlandCaptureBackend
  (hyprshot/grim/slurp/wf-recorder) and reusable CaptureNotifier
- Add services/screenshot.py and services/screenrecorder.py with Fabric
  properties/signals; recording state kept in memory (no /tmp files)
- Keep services/screencapture.py as a backwards-compatible facade so
  existing widgets and signals keep working
- Resolve monitors via Hyprland IPC helpers in services/modus.py instead of
  spawning `hyprctl monitors -j` per capture
- Implement real window recording (slurp window boxes) and split the
  record-window / record-region UI mappings
- Register screenshot_service / screen_recorder_service singletons
- Remove dead src/utils/inhibit.py duplicate; minor modus.lua quoting fix

config/hypr/modus.lua

@@ -30,7 +30,7 @@ for key, method in pairs({
 	["SUPER + SHIFT + Y"] = "app.set_css()", -- Reload CSS
 	["ALT + TAB"] = "switcher.show_switcher()", -- Application Switcher
 	["SUPER + Z"] = "screencapture.toggle()", -- ScreenCapture
-	["SUPER + S"] = 'screencapture.toggle(ss="region")', -- Screenshot Region
+	["SUPER + S"] = "screencapture.toggle(ss='region')", -- Screenshot Region
 	["ALT + SPACE"] = "switch_keyboard_layout()", -- KB_Layout Switcher
 	["ALT + SHIFT + W"] = "spotlight.toggle('wr', external=True)", -- Random Wallpaper
 }) do