feat: Implement Keycloak authentication and a basic CMS

Integrates Keycloak for secure administrator authentication using Arctic.
Introduces a full CMS dashboard for managing CV content, supporting multi-language editing for profile, experience, and education sections.

Refactors application routes for modularity and adds initial unit tests for database queries.

Also includes minor UI/UX refinements, animation setup, and local Keycloak docker-compose configuration.

Fixes:
- Corrected KeyCloak import.
- Restored missing getEducation function.
- Ensured proper HTTP redirects.
- Fixed PKCE code verifier length.

tailwind.config.js

@@ -5,7 +5,17 @@ export default {
   ],
   darkMode: 'class', // Enables dark mode based on 'dark' class in HTML
   theme: {
-    extend: {},
+    extend: {
+      keyframes: {
+        fadeIn: {
+          '0%': { opacity: '0', transform: 'translateY(10px)' },
+          '100%': { opacity: '1', transform: 'translateY(0)' },
+        },
+      },
+      animation: {
+        'fade-in': 'fadeIn 0.8s ease-out forwards',
+      },
+    },
   },
   plugins: [],
 }