Add Dockerfile for deployment.

.dockerignore

@@ -0,0 +1,17 @@
+# VCS / editor
+.git
+.gitignore
+*.md
+
+# Node build artifacts (rebuilt inside the web stage)
+web/node_modules
+web/dist
+web/tsconfig.tsbuildinfo
+
+# Local runtime data / secrets (never ship these into the image)
+data
+.env
+
+# Docker files themselves
+Dockerfile
+.dockerignore