cinny: version-control the production nginx site config

The chat.lotusguild.org nginx config (LXC 106) was edited directly on the box
and never tracked — which is how its CSP drifted (kept a dead Sentry URL and
blocked matrix.org logins). Snapshot it as cinny/nginx.conf (verbatim from prod,
incl. the corrected connect-src that now allows matrix.org/*.matrix.org) and
deploy it via lxc106-cinny.sh: back up the live file, swap, `nginx -t`, and
reload only on success (auto-restore the backup if validation fails, so a bad
config can't take the site down). TLS terminates at the NPM proxy, so this is a
plain HTTP server block with no secrets.

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

deploy/lxc106-cinny.sh

@@ -1,7 +1,8 @@
 #!/bin/bash
 # Auto-deploy script for LXC 106 (cinny)
-# Handles: cinny/config.json, cinny/upstream-check.sh, cinny/lotus-build.sh,
-#          deploy/hooks-lxc106.json, systemd/cinny-upstream-check.cron
+# Handles: cinny/config.json, cinny/nginx.conf, cinny/upstream-check.sh,
+#          cinny/lotus-build.sh, deploy/hooks-lxc106.json,
+#          systemd/cinny-upstream-check.cron
 # Triggered by: Gitea webhook on push to main
 set -euo pipefail
 
@@ -14,7 +15,7 @@ echo "=== $(date) === LXC106 deploy triggered ==="
 
 if [ ! -d "$REPO_DIR/.git" ]; then
     git clone "$CLONE_URL" "$REPO_DIR"
-    CHANGED="cinny/config.json cinny/upstream-check.sh cinny/lotus-build.sh deploy/hooks-lxc106.json systemd/cinny-upstream-check.cron"
+    CHANGED="cinny/config.json cinny/nginx.conf cinny/upstream-check.sh cinny/lotus-build.sh deploy/hooks-lxc106.json systemd/cinny-upstream-check.cron"
 else
     cd "$REPO_DIR"
     git fetch --all
@@ -31,6 +32,23 @@ if echo "$CHANGED" | grep -q '^cinny/config.json'; then
     echo "✓ config.json deployed"
 fi
 
+if echo "$CHANGED" | grep -q '^cinny/nginx.conf'; then
+    echo "Deploying cinny nginx site config..."
+    # Back up the live config, swap in the repo copy, and validate before
+    # reloading. If `nginx -t` fails, restore the backup and skip the reload so
+    # a bad config can never take the site down.
+    BACKUP="/etc/nginx/sites-available/cinny.bak-$(date +%Y%m%d%H%M%S)"
+    cp /etc/nginx/sites-available/cinny "$BACKUP"
+    cp "$REPO_DIR/cinny/nginx.conf" /etc/nginx/sites-available/cinny
+    if nginx -t; then
+        systemctl reload nginx
+        echo "✓ nginx site config deployed + reloaded"
+    else
+        echo "✗ nginx -t FAILED — restoring previous config, skipping reload"
+        cp "$BACKUP" /etc/nginx/sites-available/cinny
+    fi
+fi
+
 if echo "$CHANGED" | grep -q '^cinny/upstream-check.sh'; then
     echo "Deploying upstream-check.sh..."
     cp "$REPO_DIR/cinny/upstream-check.sh" /usr/local/bin/cinny-upstream-check.sh