fix(nginx): add missing endpoint proxies to prevent 405 errors

add_to_queue, restart_connection, controller_restart,
recover_sensor_homing, run_theta_rho_file, download,
check_software_update, and update_software were missing from the
nginx proxy allowlist, causing POST requests to fall through to the
static file handler which returns 405 Method Not Allowed.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

nginx.conf

@@ -42,7 +42,7 @@ server {
     }
 
     # All backend API endpoints (legacy non-/api/ routes)
-    location ~ ^/(list_theta_rho_files|preview_thr_batch|get_theta_rho_coordinates|upload_theta_rho|pause_execution|resume_execution|stop_execution|force_stop|soft_reset|skip_pattern|set_speed|get_speed|restart|shutdown|run_pattern|run_playlist|connect_device|disconnect_device|home_device|clear_sand|move_to_position|get_playlists|save_playlist|delete_playlist|rename_playlist|reorder_playlist|delete_theta_rho_file|get_status|list_serial_ports|serial_status|cache-progress|rebuild_cache|get_led_config|set_led_config|get_wled_ip|set_wled_ip|led|send_home|send_coordinate|move_to_center|move_to_perimeter|run_theta_rho|connect|disconnect|list_theta_rho_files_with_metadata|list_all_playlists|get_playlist|create_playlist|modify_playlist|add_to_playlist|preview_thr|preview) {
+    location ~ ^/(list_theta_rho_files|preview_thr_batch|get_theta_rho_coordinates|upload_theta_rho|pause_execution|resume_execution|stop_execution|force_stop|soft_reset|skip_pattern|set_speed|get_speed|restart|shutdown|run_pattern|run_playlist|connect_device|disconnect_device|home_device|clear_sand|move_to_position|get_playlists|save_playlist|delete_playlist|rename_playlist|reorder_playlist|delete_theta_rho_file|get_status|list_serial_ports|serial_status|cache-progress|rebuild_cache|get_led_config|set_led_config|get_wled_ip|set_wled_ip|led|send_home|send_coordinate|move_to_center|move_to_perimeter|run_theta_rho|connect|disconnect|list_theta_rho_files_with_metadata|list_all_playlists|get_playlist|create_playlist|modify_playlist|add_to_playlist|preview_thr|preview|add_to_queue|restart_connection|controller_restart|recover_sensor_homing|run_theta_rho_file|download|check_software_update|update_software) {
         proxy_pass http://127.0.0.1:8080;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;