[client/ui] Replace fyne UI with Wails (rename ui-wails to ui)

Removes the legacy fyne-based client/ui implementation and renames the
Wails replacement (client/ui-wails) to take its place at client/ui. Go
imports, frontend bindings, CI workflows, goreleaser configs and the
windows .syso icon path are updated to follow the rename.

client/ui/frontend/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "netbird-ui",
+  "private": true,
+  "version": "0.0.1",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build:dev": "tsc && vite build --minify false --mode development",
+    "build": "tsc && vite build --mode production",
+    "preview": "vite preview",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@wailsio/runtime": "latest",
+    "clsx": "^2.1.1",
+    "lucide-react": "^0.469.0",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "react-router-dom": "^7.1.3",
+    "tailwind-merge": "^2.6.0"
+  },
+  "devDependencies": {
+    "@types/react": "^18.3.18",
+    "@types/react-dom": "^18.3.5",
+    "@vitejs/plugin-react": "^4.3.4",
+    "autoprefixer": "^10.4.20",
+    "postcss": "^8.5.1",
+    "tailwindcss": "^3.4.17",
+    "tailwindcss-animate": "^1.0.7",
+    "typescript": "^5.7.3",
+    "vite": "^6.0.7"
+  }
+}