feat(editor): DBC→JSON export for open format zone data tables

- DBCExporter: converts Blizzard DBC binary data tables to JSON
- Exports zone-relevant DBCs: AreaTable, Map, Light, LightParams,
  ZoneMusic, SoundAmbience, GroundEffectTexture/Doodad, LiquidType
- Auto-detects string vs numeric vs float fields
- Zone export now includes data/ directory with JSON DBCs
- Client can load these via existing CSV/JSON fallback paths

Format replacement progress:
- DONE: ADT → WOT/WHM (terrain)
- DONE: WDT → zone.json (map definition)
- DONE: BLP → PNG (textures)
- DONE: DBC → JSON (data tables)
- TODO: M2 → open model format
- TODO: WMO → open building format

tools/editor/editor_app.cpp

@@ -4,6 +4,7 @@
 #include "content_pack.hpp"
 #include "wowee_terrain.hpp"
 #include "texture_exporter.hpp"
+#include "dbc_exporter.hpp"
 #include "core/coordinates.hpp"
 #include "rendering/vk_context.hpp"
 #include "pipeline/adt_loader.hpp"
@@ -740,6 +741,9 @@ void EditorApp::exportZone(const std::string& outputDir) {
         LOG_INFO("Exported ", exported, " textures as PNG");
     }
 
+    // Export zone-relevant DBCs as JSON (open format replacement for DBC)
+    DBCExporter::exportZoneDBCs(assetManager_.get(), base + "/data");
+
     // Export open terrain format alongside ADT
     std::string openBase = base + "/" + loadedMap_ + "_" +
                            std::to_string(loadedTileX_) + "_" + std::to_string(loadedTileY_);