Add Docker setup for containerized deployment

- Dockerfile with nginx:alpine for minimal image size
- docker-compose.yml with container name "mischlabs" on port 8085
- nginx.conf with static asset caching and security headers
- Updated Brain.md with deployment documentation

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

nginx.conf

@@ -0,0 +1,22 @@
+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Cache static assets
+    location ~* \.(css|js|png|jpg|jpeg|gif|ico|svg|woff2?)$ {
+        expires 7d;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # Security headers
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+}