Add gpsd installation to setup-dev.sh

Include gpsd daemon in the setup script for both macOS (via Homebrew)
and Debian/Ubuntu (via apt with gpsd-clients). Also add gpsd to the
required tools check.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

setup-dev.sh

@@ -123,6 +123,10 @@ check_tools() {
   check_required "rtl_433"     "433MHz sensor decoder" rtl_433 rtl433
   check_required "dump1090"    "ADS-B decoder" dump1090
 
+  echo
+  info "GPS:"
+  check_required "gpsd" "GPS daemon" gpsd
+
   echo
   info "Audio:"
   check_required "ffmpeg" "Audio encoder/decoder" ffmpeg
@@ -241,6 +245,7 @@ install_macos_packages() {
   brew_install aircrack-ng
   brew_install hcxtools
   brew_install soapysdr
+  brew_install gpsd
 
   warn "macOS note: hcitool/hciconfig are Linux (BlueZ) utilities and often unavailable on macOS."
   echo
@@ -335,6 +340,7 @@ install_debian_packages() {
   apt_install hcxtools || true
   apt_install bluez bluetooth || true
   apt_install soapysdr-tools || true
+  apt_install gpsd gpsd-clients || true
 
   # dump1090: apt first; source fallback; hard fail inside if it can't build
   if ! cmd_exists dump1090; then