P0: scaffold Vite + Vue 3 + Tauri v2

- pnpm + TS + Tailwind 3 + Pinia + Vue Router with hash history
- 6 placeholder views (Status, Peers, Routes, Messages, Topics, Settings)
  rendered via lucide-icon sidebar in App.vue
- Tauri v2: shell, store, log, dialog plugins; bundle targets deb +
  appimage; sidecar wired via externalBin = binaries/mycelium
- scripts/fetch-mycelium.sh pins v0.6.1, maps musl asset onto
  gnu target triple expected by Tauri bundler
- CI: pnpm typecheck + cargo fmt/clippy/test

src-tauri/tauri.conf.json

@@ -0,0 +1,47 @@
+{
+  "$schema": "https://schema.tauri.app/config/2",
+  "productName": "Mycellium UI",
+  "version": "0.1.0",
+  "identifier": "tech.threefold.mycellium-ui",
+  "build": {
+    "beforeDevCommand": "pnpm dev",
+    "devUrl": "http://localhost:1420",
+    "beforeBuildCommand": "pnpm build",
+    "frontendDist": "../dist"
+  },
+  "app": {
+    "withGlobalTauri": false,
+    "windows": [
+      {
+        "label": "main",
+        "title": "Mycellium",
+        "width": 1100,
+        "height": 720,
+        "minWidth": 800,
+        "minHeight": 600,
+        "resizable": true
+      }
+    ],
+    "security": {
+      "csp": null
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": ["deb", "appimage"],
+    "category": "Network",
+    "shortDescription": "Mycelium overlay network client",
+    "longDescription": "Desktop GUI for the Mycelium end-to-end encrypted IPv6 overlay network.",
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/128x128@2x.png"
+    ],
+    "externalBin": ["binaries/mycelium"],
+    "linux": {
+      "deb": {
+        "depends": ["policykit-1"]
+      }
+    }
+  }
+}