feat: kit-busrouter v2.0 — complete Synology + GL fleet router platform

Includes:
- package/ GL-XE3000 kit-busrouter (opkg)
- scripts/provision.sh (GL) and provision-synology.sh (Synology)
- syno-balance/ — new WAN balancer replacing aiwanbal (SmartWAN adapter)
- kit-connect/ — unified connectivity SPK (Tailscale + reverse SSH)
- docs/deployment/synology-rt2600ac-checklist.md — 62-point checklist
- docs/provisioning/device-identity.md — fleet identity spec
- docs/pilot/checklist.md — field pilot validation
- x4078_20260721.dss — reference config backup

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

kit-connect/INFO

@@ -0,0 +1,10 @@
+package="kit-connect"
+version="0.1-0001"
+description="Unified management connectivity for Pioneer bus fleet routers. Single SPK — deploys Tailscale + reverse SSH tunnel. Hub auto-assigns ports on install. One package, all routers."
+maintainer="Keylink IT"
+arch="ipq806x"
+firmware="1.3.1-9346"
+checkport="no"
+startable="yes"
+displayname="KIT Bus Router Connect"
+thirdparty="yes"