feat!: remove skill-side home/resting screen API

[JarbasAl]

What

Enacts the decision that the home/resting screen is a GUI render-backend concern,
not a skill concern (OVOS-GUI-1 §6.9: the resting display is owned by the render
backend; applications MUST NOT provide/register a home or resting screen). Removes
the skill-side homescreen/resting-screen API. Breaking change.

Changes

• decorators: removed resting_screen_handler and homescreen_app
• deleted IdleDisplaySkill (idle_display_skill.py) and its re-export
• OVOSSkill: removed register_resting_screen(), register_homescreen_app(), the
  init call, and the homescreen-app block in _register_app_launcher (now no-op);
  removed dead __skill_id2name and unused shutil/get_xdg_cache_save_path imports
• deleted test_idle_display_skill.py
• left the unrelated example-utterance/metadata registration intact

Breaking API removed

resting_screen_handler, homescreen_app, IdleDisplaySkill,
OVOSSkill.register_resting_screen, OVOSSkill.register_homescreen_app.

Verification

grep clean; imports resolve; pytest test/unittests -q → 480 passed.

Downstream impact (follow-up, not touched here)

• ovos-ocp-audio-plugin — emits homescreen.manager.show_active / has remove_homescreen
• ovos-skill-iss-location — calls register_resting_screen
• ovos-pydantic-models — defines home-screen models
• ovos-skill-homescreen — should be archived

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