fix: Add Livewire config and custom 404 page for subdirectory support

- Add config/livewire.php with app_url and asset_url settings
- Add custom 404 error page with consistent design
- Add error translations for all 8 languages

For subdirectory deployment:
1. Set APP_URL to include subdirectory (e.g., https://example.com/kb)
2. Set ASSET_URL if using CDN
3. Clear config cache after deployment

src/lang/de/messages.php

@@ -115,6 +115,14 @@
         'already_registered' => 'Bereits registriert?',
     ],
 
+    // Errors
+    'errors' => [
+        '404_title' => 'Seite nicht gefunden',
+        'page_not_found' => 'Seite nicht gefunden',
+        'page_not_found_description' => 'Die gesuchte Seite konnte nicht gefunden werden.',
+        'back_to_home' => 'Zurück zur Startseite',
+    ],
+
     // Profile
     'profile' => [
         'title' => 'Profil',

src/lang/en/messages.php

@@ -115,6 +115,14 @@
         'already_registered' => 'Already registered?',
     ],
 
+    // Errors
+    'errors' => [
+        '404_title' => 'Page Not Found',
+        'page_not_found' => 'Page Not Found',
+        'page_not_found_description' => 'The page you are looking for could not be found.',
+        'back_to_home' => 'Back to Home',
+    ],
+
     // Profile
     'profile' => [
         'title' => 'Profile',

src/lang/es/messages.php

@@ -115,6 +115,14 @@
         'already_registered' => '¿Ya está registrado?',
     ],
 
+    // Errors
+    'errors' => [
+        '404_title' => 'Página no encontrada',
+        'page_not_found' => 'Página no encontrada',
+        'page_not_found_description' => 'No se pudo encontrar la página que está buscando.',
+        'back_to_home' => 'Volver al inicio',
+    ],
+
     // Profile
     'profile' => [
         'title' => 'Perfil',

src/lang/fr/messages.php

@@ -115,6 +115,14 @@
         'already_registered' => 'Déjà inscrit ?',
     ],
 
+    // Errors
+    'errors' => [
+        '404_title' => 'Page non trouvée',
+        'page_not_found' => 'Page non trouvée',
+        'page_not_found_description' => 'La page que vous recherchez est introuvable.',
+        'back_to_home' => 'Retour à l\'accueil',
+    ],
+
     // Profile
     'profile' => [
         'title' => 'Profil',

src/lang/ja/messages.php

@@ -115,6 +115,14 @@
         'already_registered' => '既にアカウントをお持ちですか？',
     ],
 
+    // Errors
+    'errors' => [
+        '404_title' => 'ページが見つかりません',
+        'page_not_found' => 'ページが見つかりません',
+        'page_not_found_description' => 'お探しのページは見つかりませんでした。',
+        'back_to_home' => 'ホームに戻る',
+    ],
+
     // Profile
     'profile' => [
         'title' => 'プロフィール',

src/lang/ko/messages.php

@@ -115,6 +115,14 @@
         'already_registered' => '이미 계정이 있으신가요?',
     ],
 
+    // Errors
+    'errors' => [
+        '404_title' => '페이지를 찾을 수 없습니다',
+        'page_not_found' => '페이지를 찾을 수 없습니다',
+        'page_not_found_description' => '찾고 계신 페이지를 찾을 수 없습니다.',
+        'back_to_home' => '홈으로 돌아가기',
+    ],
+
     // Profile
     'profile' => [
         'title' => '프로필',

src/lang/zh-CN/messages.php

@@ -115,6 +115,14 @@
         'already_registered' => '已有账号？',
     ],
 
+    // Errors
+    'errors' => [
+        '404_title' => '页面未找到',
+        'page_not_found' => '页面未找到',
+        'page_not_found_description' => '您要查找的页面不存在。',
+        'back_to_home' => '返回首页',
+    ],
+
     // Profile
     'profile' => [
         'title' => '个人资料',

src/lang/zh-TW/messages.php

@@ -115,6 +115,14 @@
         'already_registered' => '已有帳號？',
     ],
 
+    // Errors
+    'errors' => [
+        '404_title' => '頁面未找到',
+        'page_not_found' => '頁面未找到',
+        'page_not_found_description' => '您要查找的頁面不存在。',
+        'back_to_home' => '返回首頁',
+    ],
+
     // Profile
     'profile' => [
         'title' => '個人資料',