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>

syno-balance/etc/syno-balance.conf

@@ -0,0 +1,35 @@
+# syno-balance — Bus Router WAN Balancer Configuration
+# Rides on top of SmartWAN. NEVER calls loadbalance.
+
+# ── WAN Interfaces ──────────────────────────────────────────────────
+WAN1_IFACE="eth0"
+WAN2_IFACE="eth2"
+
+# ── Check Interval (seconds) ────────────────────────────────────────
+CHECK_INTERVAL=30
+
+# ── Speed Test ─────────────────────────────────────────────────────
+SPEEDTEST_AUTO_ENABLED=0
+
+# ── Eyeride (WAN1 cellular via Eyeride) ────────────────────────────
+EYERIDE_ENABLE=0
+EYERIDE_IP="192.168.10.1"
+EYERIDE_PORT="8080"
+EYERIDE_USER="root"
+EYERIDE_PASSWORD=""
+
+# ── Starlink (WAN2) ─────────────────────────────────────────────────
+STARLINK_ENABLE=0
+STARLINK_IP="192.168.100.1"
+STARLINK_PORT="9200"
+
+# ── Scoring ────────────────────────────────────────────────────────
+PING_TARGETS="1.1.1.2 9.9.9.9 8.8.8.8"
+PING_COUNT=5
+WEIGHT_MIN=20
+WEIGHT_MAX=80
+ROLLING_SAMPLES=3
+
+# ── Telemetry ──────────────────────────────────────────────────────
+TELEMETRY_HUB="http://167.172.237.162:8080/api/telemetry"
+TELEMETRY_BUFFER_DIR="/tmp/syno-balance/telemetry-buf"