MAJOR: Replace nuxt-openid-connect with official Keycloak JS adapter

- Remove problematic nuxt-openid-connect module that was causing OAuth issues
- Install and implement official keycloak-js adapter for better reliability
- Create new useKeycloak composable with proper token management
- Update useUnifiedAuth to work with new Keycloak implementation
- Fix authentication middleware to support both auth methods
- Update login page to use new Keycloak login function
- Clean up configuration and remove deprecated OIDC settings
- This should resolve all the HTTP/HTTPS redirect and token exchange issues

pages/login.vue

@@ -114,8 +114,8 @@ definePageMeta({
 // Directus auth
 const { login } = useDirectusAuth();
 
-// OIDC auth for Keycloak
-const oidc = useOidc();
+// Keycloak auth for SSO
+const keycloak = useKeycloak();
 
 const loading = ref(false);
 const errorThrown = ref(false);
@@ -127,9 +127,9 @@ const passwordVisible = ref(false);
 const valid = ref(false);
 
 // Keycloak login function
-const loginWithKeycloak = () => {
-  // Redirect to dashboard after login
-  oidc.login('/dashboard');
+const loginWithKeycloak = async () => {
+  // Initialize and login with Keycloak
+  await keycloak.login();
 };
 
 // Directus login function