refactor(editor): extract clone-* duplicate handlers into cli_clone.cpp

Moves the three clone-* handlers (--clone-quest,
--clone-creature, --clone-object) out of main.cpp into a new
cli_clone.{hpp,cpp} module. All three deep-copy by index,
optionally rename, and (for creature/object) offset the new
copy by 5 yards along X to prevent z-fighting with the
original. Each resets the per-entity unique id so downstream
systems that dedupe by id stay consistent.

main.cpp shrinks by 184 lines (6,315 to 6,131).

tools/editor/cli_clone.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Dispatch the clone-* duplicate handlers — deep-copy a quest /
+// creature spawn / object placement by index, optionally
+// renaming and offsetting the new copy. Useful for templating
+// patterns: design once, clone N times.
+//   --clone-quest      duplicate a quest with all objectives + rewards
+//   --clone-creature   duplicate a spawn (default 5-yard X offset)
+//   --clone-object     duplicate an object placement (5-yard X offset)
+//
+// Returns true if matched; outRc holds the exit code.
+bool handleClone(int& i, int argc, char** argv, int& outRc);
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee