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.

docker-compose.yml

@@ -0,0 +1,37 @@
+version: '3.8'
+
+services:
+  postgres:
+    image: postgres:15
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_DB: keycloak
+      POSTGRES_USER: keycloak
+      POSTGRES_PASSWORD: password
+    networks:
+      - keycloak_network
+
+  keycloak:
+    image: quay.io/keycloak/keycloak:23.0
+    command: start-dev
+    environment:
+      KC_DB: postgres
+      KC_DB_URL: jdbc:postgresql://postgres:5432/keycloak
+      KC_DB_USERNAME: keycloak
+      KC_DB_PASSWORD: password
+      KEYCLOAK_ADMIN: admin
+      KEYCLOAK_ADMIN_PASSWORD: admin
+    ports:
+      - "8080:8080"
+    depends_on:
+      - postgres
+    networks:
+      - keycloak_network
+
+volumes:
+  postgres_data:
+
+networks:
+  keycloak_network:
+    driver: bridge