Add team-only user creation, remove public signup

- Add + New User form on Companies page (name, email, password, company)
- Create-user Supabase edge function with role verification
- Remove public signup route and login page link

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

src/App.jsx

@@ -3,8 +3,6 @@ import { AuthProvider } from './context/AuthContext';
 import ProtectedRoute from './components/ProtectedRoute';
 
 import Login from './pages/Login';
-import Signup from './pages/Signup';
-import SignupConfirmation from './pages/SignupConfirmation';
 
 import Dashboard from './pages/team/Dashboard';
 import Companies from './pages/team/Companies';
@@ -32,8 +30,6 @@ export default function App() {
       <BrowserRouter>
         <Routes>
           <Route path="/" element={<Login />} />
-          <Route path="/signup" element={<Signup />} />
-          <Route path="/signup-confirmation" element={<SignupConfirmation />} />
 
           <Route path="/dashboard" element={<ProtectedRoute role="team"><Dashboard /></ProtectedRoute>} />
           <Route path="/companies" element={<ProtectedRoute role="team"><Companies /></ProtectedRoute>} />

src/pages/Login.jsx

@@ -67,8 +67,7 @@ export default function Login() {
         </form>
 
         <p style={{ textAlign: 'center', marginTop: 20, fontSize: 13, color: '#a8a8a8' }}>
-          New client?{' '}
-          <Link to="/signup" style={{ color: 'var(--accent)' }}>Create an account</Link>
+          Contact Fourge Branding to get access.
         </p>
       </div>
     </div>