feat(web): add login + dashboard scaffold with Verde branding

Modern minimalist split-layout login (left brand panel, right form) at
/login. Sign-in posts to /api/v1/auth/login, stores the bearer token in
localStorage, redirects to /dashboard. Demo-account expander auto-fills
the form. Placeholder dashboard fetches /me, shows top nav + stat cards
(values pending), and supports sign-out.

AdminUserSeeder now seeds 4 demo admins (admin/ops/audit/demo @verde.local,
all "password"). Tailwind config gets a Verde green palette + Inter font;
component classes for buttons + form inputs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/Feature/ExampleTest.php

@@ -12,8 +12,7 @@ class ExampleTest extends TestCase
      */
     public function test_the_application_returns_a_successful_response(): void
     {
-        $response = $this->get('/');
-
-        $response->assertStatus(200);
+        $this->get('/')->assertRedirect('/login');
+        $this->get('/login')->assertOk();
     }
 }