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

middleware/authentication.ts

@@ -6,8 +6,14 @@ export default defineNuxtRouteMiddleware(async (to) => {
   const isAuthRequired = to.meta.auth !== false;
   
   // Check Keycloak auth first
-  const oidc = useOidc();
-  if (oidc.isLoggedIn) {
+  const keycloak = useKeycloak();
+  
+  // Initialize Keycloak if not already initialized
+  if (!keycloak.isInitialized.value) {
+    await keycloak.initKeycloak();
+  }
+  
+  if (keycloak.isAuthenticated.value) {
     // User authenticated with Keycloak
     return;
   }