feat(admin): create users by mobile number instead of email

Admin user management now creates accounts with a required mobile
number and an optional contact email, matching mobile-only auth.
Admin-created accounts are pre-verified (phoneVerified) so the user
can sign in by password immediately. The user list and search now
include phone.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/i18n/dictionaries/en.ts

@@ -754,20 +754,24 @@ const en: Dictionary = {
       createNewUser: 'Create New User',
       firstName: 'First Name',
       lastName: 'Last Name',
+      phone: 'Mobile number',
       email: 'Email',
+      emailOptional: 'Email (optional)',
       password: 'Password',
       firstNamePlaceholder: 'John',
       lastNamePlaceholder: 'Doe',
+      phonePlaceholder: '09123456789',
       emailPlaceholder: 'john@example.com',
       passwordMin: 'Min 8 characters',
       role: 'Role',
       roles: { user: 'User', admin: 'Admin', technical: 'Technical', sales: 'Sales' },
       creating: 'Creating...',
       createUser: 'Create User',
-      searchPlaceholder: 'Search by name or email...',
+      searchPlaceholder: 'Search by name, mobile or email...',
       noUsersSearch: 'No users found matching your search.',
       noUsers: 'No users yet.',
       colUser: 'User',
+      colPhone: 'Mobile',
       colEmail: 'Email',
       colRole: 'Role',
       colStatus: 'Status',