Fix: Add OIDC/SSO login button and hide password form when OIDC-only

- Added SSO login button on login page that appears when OIDC is configured
- Button shows provider name (e.g. 'Sign in with Authentik')
- When 'Disable password login' is enabled, hides password form and
  shows only the SSO button
- Added auth divider between password and SSO sections
- Added i18n keys (or, sso_login, sso_login_provider) for all 8 locales
- Fixed missing comma in it.json locale file

Fixes #88, Fixes #89

static/locales/de.json

@@ -283,7 +283,10 @@
     "admin_success": "Administratorkonto erfolgreich erstellt! Sie können sich jetzt anmelden.",
     "account_success": "Konto erfolgreich erstellt! Sie können sich jetzt anmelden.",
     "passwords_mismatch": "Die Passwörter stimmen nicht überein",
-    "admin_create_error": "Fehler beim Erstellen des Administratorkontos"
+    "admin_create_error": "Fehler beim Erstellen des Administratorkontos",
+    "or": "oder",
+    "sso_login": "Mit SSO anmelden",
+    "sso_login_provider": "Mit {{provider}} anmelden"
   },
   "storage": {
     "title": "Speicher",

static/locales/en.json

@@ -283,7 +283,10 @@
     "admin_success": "Administrator account created successfully! You can now sign in.",
     "account_success": "Account created successfully! You can now sign in.",
     "passwords_mismatch": "Passwords do not match",
-    "admin_create_error": "Error creating administrator account"
+    "admin_create_error": "Error creating administrator account",
+    "or": "or",
+    "sso_login": "Sign in with SSO",
+    "sso_login_provider": "Sign in with {{provider}}"
   },
   "storage": {
     "title": "Storage",

static/locales/es.json

@@ -283,7 +283,10 @@
     "admin_success": "¡Cuenta de administrador creada con éxito! Ahora puedes iniciar sesión.",
     "account_success": "¡Cuenta creada con éxito! Ahora puedes iniciar sesión.",
     "passwords_mismatch": "Las contraseñas no coinciden",
-    "admin_create_error": "Error al crear cuenta de administrador"
+    "admin_create_error": "Error al crear cuenta de administrador",
+    "or": "o",
+    "sso_login": "Iniciar sesión con SSO",
+    "sso_login_provider": "Iniciar sesión con {{provider}}"
   },
   "storage": {
     "title": "Almacenamiento",

static/locales/fa.json

@@ -269,7 +269,10 @@
     "admin_success": "حساب کاربری مدیر با موفقیت ایجاد شد! اکنون می‌توانید وارد شوید.",
     "account_success": "حساب کاربری با موفقیت ایجاد شد! اکنون می‌توانید وارد شوید.",
     "passwords_mismatch": "گذرواژه‌ها مطابقت ندارند",
-    "admin_create_error": "خطا در ایجاد حساب کاربری مدیر"
+    "admin_create_error": "خطا در ایجاد حساب کاربری مدیر",
+    "or": "یا",
+    "sso_login": "ورود با SSO",
+    "sso_login_provider": "ورود با {{provider}}"
   },
   "storage": {
     "title": "فضای ذخیره‌سازی",

static/locales/fr.json

@@ -283,7 +283,10 @@
     "admin_success": "Compte administrateur créé avec succès ! Vous pouvez maintenant vous connecter.",
     "account_success": "Compte créé avec succès ! Vous pouvez maintenant vous connecter.",
     "passwords_mismatch": "Les mots de passe ne correspondent pas",
-    "admin_create_error": "Erreur lors de la création du compte administrateur"
+    "admin_create_error": "Erreur lors de la création du compte administrateur",
+    "or": "ou",
+    "sso_login": "Se connecter avec SSO",
+    "sso_login_provider": "Se connecter avec {{provider}}"
   },
   "storage": {
     "title": "Stockage",

static/locales/it.json

@@ -283,7 +283,10 @@
  "admin_success": "Account amministratore creato con successo! Ora puoi accedere.",
  "account_success": "Account creato con successo! Ora puoi accedere.",
  "passwords_mismatch": "Le password non corrispondono",
- "admin_create_error": "Errore durante la creazione dell'account amministratore"
+ "admin_create_error": "Errore durante la creazione dell'account amministratore",
+ "or": "o",
+ "sso_login": "Accedi con SSO",
+ "sso_login_provider": "Accedi con {{provider}}"
  },
  "storage": {
  "title": "Archiviazione",
@@ -308,7 +311,7 @@
  "fa": "Persiano",
  "fr": "Francese",
  "de": "Tedesco",
- "pt": "Portoghese"
+ "pt": "Portoghese",
  "it": "Italiano"
  }
  },

static/locales/pt.json

@@ -283,7 +283,10 @@
     "admin_success": "Conta de administrador criada com sucesso! Agora você pode entrar.",
     "account_success": "Conta criada com sucesso! Agora você pode entrar.",
     "passwords_mismatch": "As senhas não coincidem",
-    "admin_create_error": "Erro ao criar conta de administrador"
+    "admin_create_error": "Erro ao criar conta de administrador",
+    "or": "ou",
+    "sso_login": "Entrar com SSO",
+    "sso_login_provider": "Entrar com {{provider}}"
   },
   "storage": {
     "title": "Armazenamento",

static/locales/zh.json

@@ -231,7 +231,10 @@
     "admin_success": "管理员账号创建成功！您现在可以登录。",
     "account_success": "账号创建成功！您现在可以登录。",
     "passwords_mismatch": "密码不匹配",
-    "admin_create_error": "创建管理员账号时出错"
+    "admin_create_error": "创建管理员账号时出错",
+    "or": "或",
+    "sso_login": "使用 SSO 登录",
+    "sso_login_provider": "使用 {{provider}} 登录"
   },
   "storage": {
     "title": "存储空间",