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/dbc_exporter.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "pipeline/dbc_loader.hpp"
+#include <string>
+#include <vector>
+
+namespace wowee {
+namespace pipeline { class AssetManager; }
+
+namespace editor {
+
+class DBCExporter {
+public:
+    // Export a DBC file as JSON with field names from layout
+    static bool exportAsJson(pipeline::AssetManager* am,
+                              const std::string& dbcName,
+                              const std::string& outputPath);
+
+    // Export all zone-relevant DBCs to JSON
+    static int exportZoneDBCs(pipeline::AssetManager* am,
+                               const std::string& outputDir);
+};
+
+} // namespace editor
+} // namespace wowee