build(docker): add Dockerfile and .dockerignore for containerization

- Create multi-stage Dockerfile with cargo-chef optimization
- Add .dockerignore to exclude unnecessary files from build context
- Include protobuf compiler and development dependencies in builder stage
- Set up proper user permissions and health check
- Configure release build with strip for smaller image size
- Add curl dependency for health check functionality

.dockerignore

@@ -0,0 +1,22 @@
+# Build artifacts
+target/
+
+# IDE
+.idea/
+.codegraph/
+
+# Git
+.git/
+.gitignore
+
+# Documentation (not needed at build time)
+*.md
+!rpc.md
+
+# Environment files
+.env
+.env.local
+
+# OS files
+.DS_Store
+Thumbs.db