Fix SSR and defensive coding for Keycloak integration

- Add proper SSR guards and error handling
- Make authentication middleware more defensive
- Add null checks in useUnifiedAuth composable
- Prevent JavaScript errors from breaking page load
- Prioritize Directus auth over Keycloak for stability

composables/useKeycloak.ts

@@ -9,7 +9,7 @@ export const useKeycloak = () => {
   const isInitialized = ref(false)
 
   const initKeycloak = async () => {
-    if (process.server) return
+    if (process.server) return false
 
     try {
       // Dynamically import keycloak-js

composables/useUnifiedAuth.ts

@@ -15,8 +15,8 @@ export const useUnifiedAuth = () => {
   
   // Create unified user object
   const user = computed<UnifiedUser | null>(() => {
-    // Check Keycloak user first
-    if (keycloak.user.value) {
+    // Check Keycloak user first (safely)
+    if (keycloak.user?.value) {
       const keycloakUser = keycloak.user.value;
       // Construct name from firstName and lastName if available
       let name = keycloakUser.name;