refactor(editor): extract zone-data maintenance into cli_zone_data.cpp

Moves three derived-data maintenance handlers (--fix-zone,
--regen-collision, --build-woc) out of main.cpp into a new
cli_zone_data.{hpp,cpp} module. Distinct from cli_repair
(which fixes manifest-vs-disk drift): these rebuild derived
terrain data and clean up JSON files via load+save:
- fix-zone re-parses + re-saves every JSON sidecar to apply
  load-time scrubs and save-time caps
- regen-collision rebuilds WOC for every WHM/WOT in a zone
- build-woc handles single-tile WOC generation

main.cpp shrinks by 104 lines (1,541 to 1,437).

tools/editor/cli_zone_data.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Dispatch the zone-data maintenance handlers — re-derive
+// stored data files (collision, JSON sidecars) from sources
+// after authoring changes. Distinct from cli_repair (which
+// fixes manifest-vs-disk drift): these rebuild derived
+// terrain data and clean up JSON files via load+save.
+//   --fix-zone         re-parse + re-save every zone JSON to apply scrubs
+//   --regen-collision  rebuild WOC for every WHM/WOT in a zone
+//   --build-woc        single-tile WOC build from a WHM/WOT base
+//
+// Returns true if matched; outRc holds the exit code.
+bool handleZoneData(int& i, int argc, char** argv, int& outRc);
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee