[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/vite.config.ts

@@ -0,0 +1,12 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+import wails from "@wailsio/runtime/plugins/vite";
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [react(), wails("./bindings")],
+  server: {
+    port: 9245,
+    strictPort: true,
+  },
+});