chore: initial scaffold

Empty repo bootstrap so cloud planning tools can ingest it.
Architecture and implementation plan tracked separately.

README.md

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+# mycellium-ui
+
+Cross-platform desktop GUI for [Mycelium](https://github.com/threefoldtech/mycelium) — Threefold's end-to-end encrypted IPv6 overlay network.
+
+Status: scaffolding. See the implementation plan for architecture, IPC protocol, and phasing.
+
+## Stack (planned)
+
+- **App**: Tauri v2 + Vue 3 + TypeScript
+- **Daemon**: Rust (`myceliumd`) running as system service, IPC via Unix socket / named pipe
+- **Mycelium engine**: official `mycelium` binary embedded as Tauri sidecar
+- **Targets v1**: Linux + Windows