feat: add initial styling and layout for portal views

- Created a global CSS file for consistent styling across the application.
- Implemented the Explore, Home, Topics, and various user views with responsive design.
- Added a Login view with OTP functionality and a Checkout view for order processing.
- Developed a NotFound view for handling 404 errors.
- Established a configuration file for Vite with Tailwind CSS integration.

frontend/portal/src/views/creator/ApplyView.vue

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+<template>
+  <div class="mx-auto max-w-3xl my-12 bg-white rounded-xl shadow-sm border border-slate-100 p-8">
+    <h1 class="text-2xl font-bold mb-4 text-center">Creator Application</h1>
+    <p class="text-slate-500 text-center mb-8">Join us and start your creative journey.</p>
+    <p class="text-slate-400 text-center">(Implementation pending based on PAGE_TENANT_APPLY.md)</p>
+  </div>
+</template>

frontend/portal/src/views/creator/ContentsView.vue

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+<template>
+  <div class="p-8">
+    <h1 class="text-2xl font-bold mb-4">Creator Contents</h1>
+    <p class="text-slate-400">(List of contents)</p>
+  </div>
+</template>

frontend/portal/src/views/creator/DashboardView.vue

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+<template>
+  <div class="p-8">
+    <h1 class="text-2xl font-bold mb-4">Creator Dashboard</h1>
+    <p class="text-slate-500">Welcome to the Creator Center.</p>
+    <p class="text-slate-400 mt-2">(Implementation pending based on PAGE_TENANT_MANAGEMENT.md)</p>
+  </div>
+</template>

frontend/portal/src/views/creator/OrdersView.vue

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+<template>
+  <div class="p-8">
+    <h1 class="text-2xl font-bold mb-4">Creator Orders</h1>
+    <p class="text-slate-400">(List of orders)</p>
+  </div>
+</template>

frontend/portal/src/views/creator/SettingsView.vue

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+<template>
+  <div class="p-8">
+    <h1 class="text-2xl font-bold mb-4">Creator Settings</h1>
+    <p class="text-slate-400">(Tenant settings)</p>
+  </div>
+</template>