Doctor: accept all module arg, survive empty mirrorlist

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QKxGW1raAWaqeU8WdHsMsp

bin/omarchy-cn-doctor

@@ -11,7 +11,7 @@ module="all"
 fix="false"
 for arg in "$@"; do
   case "$arg" in
-  network | mirror | dev-mirror) module="$arg" ;;
+  all | network | mirror | dev-mirror) module="$arg" ;;
   --fix) fix="true" ;;
   *)
     echo "Unknown argument: $arg" >&2
@@ -43,7 +43,7 @@ check_network() {
 check_mirror() {
   local primary speed ttfb age
 
-  primary=$(grep -sE '^Server' "$CN_MIRRORLIST" | head -1 | sed -E 's/^Server = //; s|/\$repo/os/\$arch/?$||')
+  primary=$(grep -sE '^Server' "$CN_MIRRORLIST" | head -1 | sed -E 's/^Server = //; s|/\$repo/os/\$arch/?$||' || true)
   if [[ -z $primary ]]; then
     echo "FAIL mirror: no Server entries in $CN_MIRRORLIST"
     failures=$((failures + 1))