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/postinst

@@ -0,0 +1,43 @@
+#!/bin/sh
+# kit-connect postinst — register with hub, set up config
+PKG_DIR="/var/packages/kit-connect/target"
+CONF="/etc/kit-connect/connect.conf"
+LOG_TAG="kit-connect"
+
+log() { logger -t "$LOG_TAG" -p local0.warn "$*"; }
+
+mkdir -p /etc/kit-connect "$PKG_DIR/var"
+
+# If config doesn't exist, create from template
+if [ ! -f "$CONF" ]; then
+	cp "$PKG_DIR/conf/connect.conf" "$CONF"
+fi
+
+# Prompt for device ID if not set
+DEVICE_ID=$(cat /etc/busrouter/device-id 2>/dev/null || echo "")
+if [ -z "$DEVICE_ID" ]; then
+	DEVICE_ID=$(hostname 2>/dev/null || echo "unknown")
+fi
+
+# Write device ID into config
+sed -i "s/^DEVICE_ID=.*/DEVICE_ID=$DEVICE_ID/" "$CONF" 2>/dev/null
+
+# Set hostname for Tailscale
+sed -i "s/^TAILSCALE_HOSTNAME=.*/TAILSCALE_HOSTNAME=$DEVICE_ID/" "$CONF" 2>/dev/null
+
+# Install tailscale binaries if not present
+if [ ! -f /usr/local/bin/tailscale ]; then
+	if [ -f "$PKG_DIR/bin/tailscale" ]; then
+		cp "$PKG_DIR/bin/tailscale" "$PKG_DIR/bin/tailscaled" /usr/local/bin/ 2>/dev/null
+		chmod +x /usr/local/bin/tailscale /usr/local/bin/tailscaled 2>/dev/null
+	fi
+fi
+
+# Set key permissions
+chmod 600 "$PKG_DIR/bin/connect_id_ed25519" 2>/dev/null
+
+# Try hub registration (non-fatal — daemon retries)
+curl -s --connect-timeout 10 "http://162.243.83.36:8080/api/register/${DEVICE_ID}" 2>/dev/null || true
+
+log "postinst complete — device=${DEVICE_ID}"
+exit 0

kit-connect/scripts/postuninst

@@ -0,0 +1,2 @@
+#!/bin/sh
+exit 0

kit-connect/scripts/preinst

@@ -0,0 +1,2 @@
+#!/bin/sh
+exit 0

kit-connect/scripts/preuninst

@@ -0,0 +1,2 @@
+#!/bin/sh
+exit 0

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