feat: add password change functionality

- Add password change button to sidebar account menu
- Create PasswordChangeDialog component with shadcn UI components
- Implement backend API endpoint /api/v1/user/change-password
- Add form validation with current password verification
- Include internationalization support for Chinese and English
- Add proper error handling and success notifications

Co-Authored-By: Rock <rockchinq@gmail.com>

web/src/i18n/locales/en-US.ts

@@ -44,6 +44,20 @@ const enUS = {
     forgotPassword: 'Forgot Password?',
     loading: 'Loading...',
     theme: 'Theme',
+    changePassword: 'Change Password',
+    currentPassword: 'Current Password',
+    newPassword: 'New Password',
+    confirmNewPassword: 'Confirm New Password',
+    enterCurrentPassword: 'Enter current password',
+    enterNewPassword: 'Enter new password',
+    enterConfirmPassword: 'Confirm new password',
+    currentPasswordRequired: 'Current password is required',
+    newPasswordRequired: 'New password is required',
+    confirmPasswordRequired: 'Confirm password is required',
+    passwordsDoNotMatch: 'Passwords do not match',
+    changePasswordSuccess: 'Password changed successfully',
+    changePasswordFailed: 'Failed to change password',
+    currentPasswordIncorrect: 'Current password is incorrect',
   },
   notFound: {
     title: 'Page not found',