feat: kit-connect + syno-balance SPK builds, busfleet hub registration endpoint

- kit-connect SPK (ipq806x): postinst with hub registration, start-stop-status,
  connect-daemon management, Tailscale + reverse SSH tunnel integration
- syno-balance SPK (noarch, test build): SmartWAN-aware dual-WAN load
  balancer with 6-factor scoring engine, syno-daemon lifecycle
- Busfleet hub: register.sh (port pool 2230-2299), Python HTTP server,
  systemd service, port-registry.json with x4078/x5925 assignments
- .gitignore: exclude SSH keys (*_id_ed25519), SPK artifacts (*.spk)

Gitea releases:
- kit-connect v0.1-0001 → x5925-kit-connect-v1 (production)
- syno-balance v0.1-0001 → syno-balance-test-v1 (prerelease)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

kit-connect/scripts/start-stop-status

@@ -0,0 +1,35 @@
+#!/bin/sh
+
+PKG="kit-connect"
+PKG_DIR="/var/packages/${PKG}/target"
+DAEMON="${PKG_DIR}/bin/connect-daemon.sh"
+DAEMON_PID="${PKG_DIR}/var/daemon.pid"
+
+case "$1" in
+  start)
+    mkdir -p "${PKG_DIR}/var"
+    if [ -f "$DAEMON_PID" ] && kill -0 "$(cat "$DAEMON_PID")" 2>/dev/null; then
+      echo "Already running"
+      exit 0
+    fi
+    setsid "$DAEMON" &
+    echo $! > "$DAEMON_PID"
+    echo "Started"
+    ;;
+  stop)
+    if [ -f "$DAEMON_PID" ]; then
+      kill "$(cat "$DAEMON_PID")" 2>/dev/null
+      sleep 1
+      kill -9 "$(cat "$DAEMON_PID")" 2>/dev/null
+      rm -f "$DAEMON_PID"
+    fi
+    echo "Stopped"
+    ;;
+  status)
+    [ -f "$DAEMON_PID" ] && kill -0 "$(cat "$DAEMON_PID")" 2>/dev/null && exit 0
+    exit 1
+    ;;
+  *)
+    echo "Usage: $0 {start|stop|status}"
+    ;;
+esac