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

i18n/locales/de-DE.json

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+{
+  "welcome": "Willkommen bei experimenta",
+  "app": {
+    "title": "my.experimenta.science"
+  },
+  "auth": {
+    "welcome": "Willkommen",
+    "subtitle": "Melden Sie sich an oder erstellen Sie ein Konto",
+    "login": "Anmelden",
+    "register": "Registrieren",
+    "loginTitle": "Anmelden",
+    "loginDescription": "Melden Sie sich mit Ihrer E-Mail-Adresse an",
+    "loginButton": "Anmelden",
+    "loggingIn": "Wird angemeldet...",
+    "loginInfo": "Sie werden zur sicheren Anmeldeseite weitergeleitet",
+    "loginError": "Anmeldung fehlgeschlagen. Bitte versuchen Sie es erneut.",
+    "registerTitle": "Konto erstellen",
+    "registerDescription": "Erstellen Sie ein neues experimenta-Konto",
+    "registerButton": "Konto erstellen",
+    "registering": "Wird registriert...",
+    "registrationSuccess": "Registrierung erfolgreich!",
+    "registrationSuccessMessage": "Bitte bestätigen Sie Ihre E-Mail-Adresse über den Link, den wir Ihnen gesendet haben.",
+    "registrationError": "Registrierung fehlgeschlagen. Bitte versuchen Sie es erneut.",
+    "emailAlreadyRegistered": "Diese E-Mail-Adresse ist bereits registriert.",
+    "error": "Fehler",
+    "email": "E-Mail-Adresse",
+    "emailPlaceholder": "ihre.email{'@'}beispiel.de",
+    "password": "Passwort",
+    "passwordPlaceholder": "Mindestens 8 Zeichen",
+    "passwordRequirements": "Mindestens 8 Zeichen, Groß-/Kleinbuchstaben und eine Zahl",
+    "firstName": "Vorname",
+    "firstNamePlaceholder": "Max",
+    "lastName": "Nachname",
+    "lastNamePlaceholder": "Mustermann",
+    "termsAgreement": "Mit der Registrierung stimmen Sie unserer",
+    "privacyPolicy": "Datenschutzerklärung",
+    "and": "und den",
+    "termsOfService": "Nutzungsbedingungen",
+    "validation": {
+      "invalidEmail": "Bitte geben Sie eine gültige E-Mail-Adresse ein",
+      "passwordMinLength": "Das Passwort muss mindestens 8 Zeichen lang sein",
+      "passwordUppercase": "Das Passwort muss mindestens einen Großbuchstaben enthalten",
+      "passwordLowercase": "Das Passwort muss mindestens einen Kleinbuchstaben enthalten",
+      "passwordNumber": "Das Passwort muss mindestens eine Zahl enthalten",
+      "firstNameMinLength": "Der Vorname muss mindestens 2 Zeichen lang sein",
+      "lastNameMinLength": "Der Nachname muss mindestens 2 Zeichen lang sein"
+    }
+  }
+}

i18n/locales/en-US.json

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+{
+  "welcome": "Welcome to experimenta",
+  "app": {
+    "title": "my.experimenta.science"
+  },
+  "auth": {
+    "welcome": "Welcome",
+    "subtitle": "Sign in or create an account",
+    "login": "Sign In",
+    "register": "Sign Up",
+    "loginTitle": "Sign In",
+    "loginDescription": "Sign in with your email address",
+    "loginButton": "Sign In",
+    "loggingIn": "Signing in...",
+    "loginInfo": "You will be redirected to our secure login page",
+    "loginError": "Login failed. Please try again.",
+    "registerTitle": "Create Account",
+    "registerDescription": "Create a new experimenta account",
+    "registerButton": "Create Account",
+    "registering": "Creating account...",
+    "registrationSuccess": "Registration successful!",
+    "registrationSuccessMessage": "Please verify your email address using the link we sent you.",
+    "registrationError": "Registration failed. Please try again.",
+    "emailAlreadyRegistered": "This email address is already registered.",
+    "error": "Error",
+    "email": "Email Address",
+    "emailPlaceholder": "your.email{'@'}example.com",
+    "password": "Password",
+    "passwordPlaceholder": "At least 8 characters",
+    "passwordRequirements": "At least 8 characters, upper/lowercase letters and a number",
+    "firstName": "First Name",
+    "firstNamePlaceholder": "John",
+    "lastName": "Last Name",
+    "lastNamePlaceholder": "Doe",
+    "termsAgreement": "By registering, you agree to our",
+    "privacyPolicy": "Privacy Policy",
+    "and": "and",
+    "termsOfService": "Terms of Service",
+    "validation": {
+      "invalidEmail": "Please enter a valid email address",
+      "passwordMinLength": "Password must be at least 8 characters",
+      "passwordUppercase": "Password must contain at least one uppercase letter",
+      "passwordLowercase": "Password must contain at least one lowercase letter",
+      "passwordNumber": "Password must contain at least one number",
+      "firstNameMinLength": "First name must be at least 2 characters",
+      "lastNameMinLength": "Last name must be at least 2 characters"
+    }
+  }
+}