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>

cinny/nginx.conf

@@ -0,0 +1,79 @@
+server {
+    listen 80;
+    listen [::]:80;
+    server_name chat.lotusguild.org;
+
+    # Brotli compression (better than gzip for modern browsers)
+    brotli on;
+    brotli_static on;
+    brotli_comp_level 6;
+    brotli_types text/plain text/css application/javascript application/json
+                 image/svg+xml application/wasm font/woff2;
+
+    root /var/www/html;
+    server_tokens off;
+    client_max_body_size 50m;
+
+    limit_req zone=chat_limit burst=60 nodelay;
+    limit_conn chat_conn 25;
+    index index.html;
+
+    # Security headers
+    add_header X-Frame-Options SAMEORIGIN always;
+    add_header X-Content-Type-Options nosniff always;
+    add_header X-XSS-Protection "1; mode=block" always;
+    add_header Referrer-Policy strict-origin-when-cross-origin always;
+
+    # Block all source map files and dotfiles from public access
+    location ~* \.(js|css)\.map$ {
+        deny all;
+        return 404;
+    }
+    location ~ /\. {
+        deny all;
+        return 404;
+    }
+    location = /netlify.toml {
+        deny all;
+        return 404;
+    }
+
+    # Content Security Policy
+    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' blob:; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; img-src 'self' data: blob: https://matrix.lotusguild.org https://drive.lotusguild.org https://media.giphy.com https://media0.giphy.com https://media1.giphy.com https://media2.giphy.com https://media3.giphy.com https://media4.giphy.com https://www.openstreetmap.org https://tile.openstreetmap.org https://api.qrserver.com; font-src 'self' data: https://fonts.gstatic.com; connect-src 'self' https://matrix.lotusguild.org wss://matrix.lotusguild.org https://matrix.org https://*.matrix.org https://api.giphy.com https://*.giphy.com wss:; media-src 'self' https: blob:; frame-src 'self' https://www.openstreetmap.org; worker-src 'self' blob:; object-src 'none'; frame-ancestors 'none'; base-uri 'self'; form-action 'self';" always;
+
+    # Service worker must never be cached so updates are picked up immediately
+    location = /sw.js {
+        expires -1;
+        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
+    }
+
+    # Cache content-addressed static assets aggressively
+    location ~* \.(?:js|css|woff2?|png|svg|ico|webp)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable" always;
+    }
+
+    # Never cache HTML or JSON (index.html, config.json, manifest.json)
+    location ~* \.(json|html)$ {
+        expires -1;
+        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
+    }
+
+    # Auto-deploy webhook — proxied to local webhook service
+    location = /hooks/lotus-deploy {
+        proxy_pass http://127.0.0.1:9001/hooks/lotus-deploy;
+        proxy_set_header Host $host;
+        proxy_read_timeout 300;
+        proxy_connect_timeout 5;
+    }
+
+    location / {
+        rewrite ^/config\.json$          /config.json break;
+        rewrite ^/manifest\.json$        /manifest.json break;
+        rewrite ^/sw\.js$                /sw.js break;
+        rewrite ^/pdf\.worker\.min\.js$ /pdf.worker.min.js break;
+        rewrite ^/public/(.*)$           /public/$1 break;
+        rewrite ^/assets/(.*)$           /assets/$1 break;
+        rewrite ^(.+)$                   /index.html break;
+    }
+}