Implement cookie-based JWT authentication

- Introduced `CookieJWTAuthentication` for authentication via HttpOnly cookies, enabling browser-initiated requests without `Authorization` headers.
- Added authentication views (`CookieTokenObtainPairView`, `CookieTokenRefreshView`, `CookieTokenBlacklistView`) to replace default SimpleJWT views.
- Updated Vuex store and frontend logic to handle sessions using HttpOnly cookies instead of localStorage.
- Enhanced backend and frontend configurations (Django settings, router, Vuex, and API service) to fully support cookie-based authentication.
- Updated authentication tests to ensure correct cookie handling and authentication flows.

frontend/src/components/TheNavbar.vue

@@ -51,12 +51,12 @@ export default {
   },
   computed: {
     isAuthenticated() {
-      return !!this.$store.state.jwt;
+      return this.$store.getters.isAuthenticated;
     }
   },
   methods: {
     logout () {
-      store.commit('logOut')
+      store.dispatch('logout')
       router.push({name: 'login'})
     }
   }