feat: Major UI enhancement with BlackRoad brand system

- Add stunning landing page with hero, features, and CTA sections
- Update login/signup pages with dark theme and brand gradients
- Enhance Sidebar with improved navigation and brand colors
- Update AppHeader with search bar, notifications, and user menu
- Add reusable UI components (Button, Card, Input, Badge)
- Add API health and status endpoints
- Apply official BlackRoad brand colors (#FF1D6C hot pink, #F5A623 amber, #2979FF electric blue, #9C27B0 violet)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/api/health/route.ts

@@ -0,0 +1,21 @@
+import { NextResponse } from 'next/server';
+
+export const runtime = 'edge';
+
+export async function GET() {
+  const health = {
+    status: 'healthy',
+    service: 'blackroad-os-web',
+    version: process.env.npm_package_version || '0.1.0',
+    timestamp: new Date().toISOString(),
+    uptime: process.uptime ? process.uptime() : null,
+    environment: process.env.NODE_ENV || 'development',
+  };
+
+  return NextResponse.json(health, {
+    status: 200,
+    headers: {
+      'Cache-Control': 'no-cache, no-store, must-revalidate',
+    },
+  });
+}