Add auto-deployment infrastructure for all 4 LXCs

- Per-LXC deploy scripts (lxc151-hookshot, lxc106-cinny, lxc139-landing, lxc110-draupnir)
- Per-LXC webhook hook configs with unique HMAC-SHA256 secrets
- Livekit graceful restart script + systemd timer (waits for zero active calls)
- Fix hookshot/deploy.sh capitalization bug (Uptime-Kuma, Tinker-Tickets, etc.)

Each LXC independently clones repo and runs its own deploy.sh via adnanh/webhook on port 9000.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

deploy/hooks-lxc110.json

@@ -0,0 +1,18 @@
+[
+  {
+    "id": "matrix-deploy",
+    "execute-command": "/usr/local/bin/matrix-deploy.sh",
+    "command-working-directory": "/opt/matrix-config",
+    "response-message": "Deploying draupnir config...",
+    "trigger-rule": {
+      "match": {
+        "type": "payload-hash-sha256",
+        "secret": "0d23fab8743e9ee6b52cbd05a889b04c927ffa2b2b21fe50244f1a534d1a22d0",
+        "parameter": {
+          "source": "header",
+          "name": "X-Gitea-Signature"
+        }
+      }
+    }
+  }
+]