feat: Add confirmation modal for script installation and server sorting

[michelroegl-brunner]

Summary

This PR adds a confirmation modal before script execution when only one server is saved, and implements alphabetical sorting of servers by name.

Changes

Confirmation Modal

• Single Server: Shows confirmation modal with script name and server details
• Multiple Servers: Preserves existing behavior with server selection dropdown
• Auto-selection: Single server is auto-selected but requires user confirmation
• No Auto-execution: Removed immediate execution when only one server exists

Server Sorting

• Alphabetical Order: Servers are now sorted by name (PROX2 before PROX3)
• Consistent Sorting: Applied across all components (dropdown, settings modal, confirmation modal)
• Safe Sorting: Uses nullish coalescing operators for proper handling of undefined names

Technical Details

• Modified to show confirmation UI for single server scenario
• Updated and with server sorting
• Fixed ESLint issues with nullish coalescing operators
• Maintained SSH mode as the only execution method

Testing

• ✅ Build passes successfully
• ✅ No linting errors
• ✅ TypeScript compilation successful
• ✅ Confirmation modal displays correctly for single server
• ✅ Server sorting works in all components

Screenshots

Single Server Confirmation:

• Shows script name prominently
• Displays server details (name, IP) in styled card
• "Install" and "Cancel" buttons

Multiple Servers:

• Server selection dropdown with no pre-selection
• "Run on Server" button (disabled until selection)

Fixes the issue where PROX3 appeared before PROX2 in server lists.