feat(auth): add login page

- Create professional login page with two-column desktop layout
- Add reusable LoginForm component with validation
- Implement show/hide password toggle
- Add loading state and error handling with next-auth
- Create auth layout with gradient background and decorative patterns
- Include branding with Padel Pro logo and feature highlights
- Responsive design: stacked layout on mobile

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/app/(auth)/layout.tsx

@@ -0,0 +1,31 @@
+import { AuthProvider } from '@/components/providers/auth-provider';
+
+export default function AuthLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  return (
+    <AuthProvider>
+      <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-primary-900 via-primary-800 to-primary-700 relative overflow-hidden">
+        {/* Decorative pattern background */}
+        <div className="absolute inset-0 opacity-10">
+          <div
+            className="absolute inset-0"
+            style={{
+              backgroundImage: `url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.4'%3E%3Ccircle cx='30' cy='30' r='4'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E")`,
+              backgroundSize: '60px 60px',
+            }}
+          />
+        </div>
+
+        {/* Decorative shapes */}
+        <div className="absolute top-0 left-0 w-96 h-96 bg-accent/20 rounded-full blur-3xl -translate-x-1/2 -translate-y-1/2" />
+        <div className="absolute bottom-0 right-0 w-96 h-96 bg-primary-500/30 rounded-full blur-3xl translate-x-1/2 translate-y-1/2" />
+
+        {/* Content */}
+        <div className="relative z-10 w-full">{children}</div>
+      </div>
+    </AuthProvider>
+  );
+}