refactor(editor): extract creature/object/quest info into cli_content_info.cpp

Moves 16 contiguous content-inspection handlers out of main.cpp:

  --info-creatures              --info-creatures-by-faction
  --info-creatures-by-level     --info-objects-by-path
  --info-objects-by-type        --info-quests-by-level
  --info-quests-by-xp           --list-creatures
  --list-objects                --list-quests
  --list-quest-objectives       --list-quest-rewards
  --info-quest-graph-stats      --info-creature
  --info-quest                  --info-object

All read JSON sidecars (creatures.json, objects.json, quests.json)
via wowee::editor::{NpcSpawner, ObjectPlacer, QuestEditor} loaders.

main.cpp drops 17,505 → 16,564 lines (-941). Behavior verified
by running --info-creatures (correctly fails with same parse-
error message on a non-zone path).

tools/editor/cli_content_info.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Dispatch the creature/object/quest content inspection
+// handlers (16 in this group):
+//
+//   --info-creatures              --info-creatures-by-faction
+//   --info-creatures-by-level     --info-objects-by-path
+//   --info-objects-by-type        --info-quests-by-level
+//   --info-quests-by-xp           --list-creatures
+//   --list-objects                --list-quests
+//   --list-quest-objectives       --list-quest-rewards
+//   --info-quest-graph-stats      --info-creature
+//   --info-quest                  --info-object
+//
+// All read JSON sidecars (zone-spawns.json, zone-objects.json,
+// zone-quests.json) via wowee::editor::{NpcSpawner, ObjectPlacer,
+// QuestEditor} loaders.
+//
+// Returns true if matched; outRc holds the exit code.
+bool handleContentInfo(int& i, int argc, char** argv, int& outRc);
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee