feat(backend): serve static frontend files

backend/public/README.md

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+# Static Frontend Hosting
+
+All files in this directory will be merged into the server binary and served as static assets by the HexDeck server.
+
+When building with docker, the compiled frontend will be copied here automatically.
+
+If you are building manually, you can copy the contents of the `dist/client/` folder here after building the frontend.