scaffold: Vue 3 frontend — router, stores, views, composables, layouts

Complete frontend skeleton: Vite + Vue 3 + TypeScript + Tailwind CSS,
Pinia stores (auth, server, wipe, plugins), authenticated API composable,
full route tree with auth guards, DashboardLayout with sidebar nav,
23 view stubs across auth/admin/public, all TypeScript interfaces.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/style.css

@@ -0,0 +1,22 @@
+@import "tailwindcss";
+
+/* Corrosion Platform — Custom Styles */
+
+/* Dark mode is default — Rust servers run at night */
+:root {
+  --corrosion-red: #ef4444;
+  --corrosion-orange: #f97316;
+  --corrosion-dark: #0f0f0f;
+  --corrosion-surface: #1a1a1a;
+  --corrosion-border: #2a2a2a;
+}
+
+body {
+  @apply bg-neutral-950 text-neutral-100 antialiased;
+  margin: 0;
+  min-height: 100vh;
+}
+
+#app {
+  min-height: 100vh;
+}