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/assets/main.css

@@ -0,0 +1,30 @@
+@import "tailwindcss";
+@plugin "tailwindcss-animate";
+
+:root {
+  --color-primary-50: #eff6ff;
+  --color-primary-100: #dbeafe;
+  --color-primary-200: #bfdbfe;
+  --color-primary-300: #93c5fd;
+  --color-primary-400: #60a5fa;
+  --color-primary-500: #3b82f6;
+  --color-primary-600: #2563eb;
+  --color-primary-700: #1d4ed8;
+  --color-primary-800: #1e40af;
+  --color-primary-900: #1e3a8a;
+  --color-primary-950: #172554;
+}
+
+@theme {
+  --color-primary-50: var(--color-primary-50);
+  --color-primary-100: var(--color-primary-100);
+  --color-primary-200: var(--color-primary-200);
+  --color-primary-300: var(--color-primary-300);
+  --color-primary-400: var(--color-primary-400);
+  --color-primary-500: var(--color-primary-500);
+  --color-primary-600: var(--color-primary-600);
+  --color-primary-700: var(--color-primary-700);
+  --color-primary-800: var(--color-primary-800);
+  --color-primary-900: var(--color-primary-900);
+  --color-primary-950: var(--color-primary-950);
+}

frontend/portal/src/assets/vue.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="37.07" height="36" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 198"><path fill="#41B883" d="M204.8 0H256L128 220.8L0 0h97.92L128 51.2L157.44 0h47.36Z"></path><path fill="#41B883" d="m0 0l128 220.8L256 0h-51.2L128 132.48L50.56 0H0Z"></path><path fill="#35495E" d="M50.56 0L128 133.12L204.8 0h-47.36L128 51.2L97.92 0H50.56Z"></path></svg>