fix: correct case-sensitive host match in runner capacity defaults

The case statement matched uppercase UNRAID/FEDORA but $r_host is always
lowercase from validate_runner_host(). Unraid and Fedora runners were
silently falling through to the default capacity of 1 instead of 2.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

setup/configure_runners.sh

@@ -461,8 +461,8 @@ for ((i = 0; i < runner_count; i++)); do
   if [[ -z "$cap_default" ]]; then
     # Smart defaults per host type
     case "$r_host" in
-      UNRAID) cap_default=2 ;;
-      FEDORA) cap_default=2 ;;
+      unraid) cap_default=2 ;;
+      fedora) cap_default=2 ;;
       *)      cap_default=1 ;;  # macOS / native
     esac
   fi