Implement authentication phase with Cidaas OAuth2 integration

- Add authentication middleware to protect routes
- Create API endpoints for login, logout, registration, and user info
- Develop UI components for login and registration forms
- Integrate VeeValidate for form validation
- Update environment configuration for Cidaas settings
- Add i18n support for English and German languages
- Enhance Tailwind CSS for improved styling of auth components
- Document authentication flow and testing procedures

.env.example

@@ -32,26 +32,26 @@ REDIS_PASSWORD=
 # For production: Set REDIS_PASSWORD
 
 # ==============================================
-# SESSION ENCRYPTION
+# SESSION ENCRYPTION (nuxt-auth-utils)
 # ==============================================
-# Generate with: openssl rand -base64 32
-NUXT_SESSION_PASSWORD=change-me-to-a-random-32-character-string-minimum
+# Generate with: openssl rand -hex 32
+NUXT_SESSION_SECRET=generate-with-openssl-rand-hex-32
 
 # ==============================================
 # CIDAAS (OAuth2/OIDC Authentication)
 # ==============================================
 # Get these from Cidaas Admin Panel
-CIDAAS_BASE_URL=https://experimenta.cidaas.de
-CIDAAS_CLIENT_ID=your-client-id
-CIDAAS_CLIENT_SECRET=your-client-secret
+CIDAAS_BASE_URL=https://experimenta-staging.cidaas.de
+CIDAAS_CLIENT_ID=...
+CIDAAS_CLIENT_SECRET=...
 CIDAAS_REDIRECT_URI=http://localhost:3000/api/auth/callback
 
 # Computed URLs (no need to change):
-# CIDAAS_AUTHORIZE_URL=${CIDAAS_BASE_URL}/authz-srv/authz
-# CIDAAS_TOKEN_URL=${CIDAAS_BASE_URL}/token-srv/token
-# CIDAAS_USERINFO_URL=${CIDAAS_BASE_URL}/users-srv/userinfo
-# CIDAAS_JWKS_URL=${CIDAAS_BASE_URL}/.well-known/jwks.json
-# CIDAAS_ISSUER=${CIDAAS_BASE_URL}
+CIDAAS_AUTHORIZE_URL=${CIDAAS_BASE_URL}/authz-srv/authz
+CIDAAS_TOKEN_URL=${CIDAAS_BASE_URL}/token-srv/token
+CIDAAS_USERINFO_URL=${CIDAAS_BASE_URL}/users-srv/userinfo
+CIDAAS_JWKS_URL=${CIDAAS_BASE_URL}/.well-known/jwks.json
+CIDAAS_ISSUER=${CIDAAS_BASE_URL}
 
 # ==============================================
 # PAYPAL (Payment Gateway)