Add WiFi configuration to settings server

[dbieber]

Summary

• Add WiFi configuration support to the settings server UI
• Create WiFi configuration section with ability to add and remove networks
• Store WiFi networks in settings and wpa_supplicant.conf
• Load existing networks from wpa_supplicant.conf when starting settings server

Test plan

• Start the settings server and verify the WiFi configuration section appears
• Add a new WiFi network and verify it's added to the list
• Save settings and verify the networks are correctly sent to the API
• Remove a WiFi network and verify it's removed from the list

🤖 Generated with Claude Code