Fix executable bits and add camera name to 4-seasons notifications

- chmod +x all *.sh and *.py in install.sh so permissions survive git checkouts
- Fix daily_sunrise_video.sh and Python scripts missing executable bit
- Add [CAM_NAME] prefix to all 4-seasons.sh notify.sh calls so multi-camera
  setups show which camera each daily clip came from
- Include camera name in output filename: YYYY-MM-DD_<cam>_MvtN-DayXofY-final.mp4

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ

install.sh

@@ -29,6 +29,9 @@ fi
 mkdir -p "$UNIT_DIR"
 echo "Installing systemd units to $UNIT_DIR ..."
 
+# ── Ensure all scripts are executable ────────────────────────────────────────
+chmod +x "$HERE"/*.sh "$HERE"/*.py 2>/dev/null || true
+
 # ── Pre-create data directories for all cameras ───────────────────────────────
 echo "Creating data directories..."
 for cam in "${CAMERAS[@]}"; do