Add Docker support with Alpine Linux

- Multi-stage Dockerfile with rust:alpine and nginx:alpine
- Optimized for small container size (~20MB)
- Includes SPA routing support and gzip compression
- Health check for container monitoring
- .dockerignore to optimize build context

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.dockerignore

@@ -0,0 +1,28 @@
+# Build artifacts
+target/
+dist/
+
+# Git
+.git/
+.gitignore
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+
+# Documentation
+README.md
+*.md
+
+# Docker
+Dockerfile
+.dockerignore