feat: rename KOL Manager to Cathy's App across various files and update related placeholders

resources/views/gate/login.blade.php

@@ -4,7 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="theme-color" content="#FFB7C5">
-    <title>KOL Manager — Login</title>
+    <title>Cathy's App - Login</title>
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link href="https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800&display=swap" rel="stylesheet">
     @vite(['resources/css/app.css', 'resources/js/app.js'])
@@ -28,7 +28,7 @@
         {{-- Logo / header --}}
         <div class="text-center mb-8 select-none">
             <div class="text-7xl mb-3 inline-block animate-bounce" style="animation-duration:2s">🐱</div>
-            <h1 class="text-2xl font-extrabold text-pink-500 leading-tight">KOL Manager</h1>
+            <h1 class="text-2xl font-extrabold text-pink-500 leading-tight">Cathy's App</h1>
             <p class="text-sm text-gray-400 mt-1">Your Purr-fect Assistant</p>
         </div>