feat(cameras): add sky-cam and frigate-audio service modules

sky-cam (cameras/non-docker):
  Clones outis1one/sky-cam via bootstrap.sh to ~/sky-cam. Prompts for
  latitude, longitude, timezone, camera names, BASE_DIR, and optional
  Mattermost webhook. Patches sky-cam.conf and installs systemd user
  timers via the repo's install.sh. Produces sunrise clips, Four Seasons
  timelapse, moon-track, and monthly moon-phase images.

frigate-audio (cameras/docker):
  Full stack from outis1one/frigate_w_audio: Frigate 0.17 NVR +
  Mosquitto MQTT broker + frigate-notify → ntfy push alerts. Audio-ready
  config template with face recognition and LPR pre-configured. Prompts
  for camera credentials, media storage path (supports drive detection),
  MQTT password (auto-generated), and ntfy server. Bootstraps the
  Mosquitto passwd file. Detector choice: CPU / USB Coral / PCIe Coral.
  Hardcoded media path from upstream replaced with a configurable prompt.

https://claude.ai/code/session_01Y4dMKtkqkpvmgDKoRdzhTG

setup.sh

@@ -82,6 +82,7 @@ is_installed() {
         silent-send) [ -d "$ACTUAL_HOME/silent-send/.git" ] ;;
         linux-to-sync) [ -d "$ACTUAL_HOME/linux-to-sync/.git" ] ;;
         sync-cc) [ -f "$ACTUAL_HOME/sync-cc/sync_cc.py" ] ;;
+        sky-cam) [ -d "$ACTUAL_HOME/sky-cam/.git" ] ;;
         *) [ -e "$DOCKER_DIR/$1" ] ;;
     esac
 }