refactor(editor): extract --list-zones / --zone-stats into cli_zone_list.cpp

Moves the two zone discovery / aggregation handlers
(--list-zones, --zone-stats) out of main.cpp into a new
cli_zone_list.{hpp,cpp} module. The first quickly enumerates
zones across the standard locations (custom_zones, output);
the second walks a project dir computing tile / creature /
quest / per-format byte totals with a per-zone breakdown
table — useful for content-pack release notes and capacity
planning.

main.cpp shrinks by 191 lines (3,624 to 3,433). Both --json
output modes preserved.

tools/editor/cli_zone_list.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Dispatch the zone discovery / aggregation handlers — list
+// every zone in the standard locations, or compute project-
+// wide tile / creature / quest / byte totals.
+//   --list-zones    quick name+dir listing across custom_zones/output
+//   --zone-stats    project-wide aggregate with per-zone breakdown
+//
+// Both support an optional trailing `--json` flag for
+// machine-readable reports.
+//
+// Returns true if matched; outRc holds the exit code.
+bool handleZoneList(int& i, int argc, char** argv, int& outRc);
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee