feat: Wowee Open Building format (.wob) — novel WMO replacement

ALL 6 BLIZZARD FORMATS NOW HAVE OPEN REPLACEMENTS.

WOB format: binary building file with groups, portals, and doodads.
- WOB1 magic header
- Groups: vertices (pos+normal+uv+color), indices, texture paths,
  bounding box, indoor/outdoor flag
- Portals: connect groups with polygon boundaries
- Doodad placements: reference .wom models with transform

WoweeBuildingLoader: load/save/exists for .wob files.

Complete format replacement table:
- ADT → WOT/WHM (terrain heightmaps + metadata)
- WDT → zone.json (map definition)
- BLP → PNG (textures)
- DBC → JSON (data tables)
- M2 → WOM (static models)
- WMO → WOB (buildings with groups/portals/doodads)

The wowee project now has a complete suite of novel, open file
formats for creating and distributing custom WoW content without
any dependency on Blizzard proprietary file formats.

include/pipeline/wowee_building.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <glm/glm.hpp>
+#include <string>
+#include <vector>
+#include <cstdint>
+
+namespace wowee {
+namespace pipeline {
+
+// Wowee Open Building format (.wob) — novel WMO replacement
+// Buildings with multiple groups, portals, and doodad sets
+struct WoweeBuilding {
+    struct Vertex {
+        glm::vec3 position;
+        glm::vec3 normal;
+        glm::vec2 texCoord;
+        glm::vec4 color; // vertex color/lighting
+    };
+
+    struct Group {
+        std::string name;
+        std::vector<Vertex> vertices;
+        std::vector<uint32_t> indices;
+        std::vector<std::string> texturePaths;
+        glm::vec3 boundMin{0}, boundMax{0};
+        bool isOutdoor = false;
+    };
+
+    struct Portal {
+        int groupA = -1, groupB = -1;
+        std::vector<glm::vec3> vertices; // portal polygon
+    };
+
+    struct DoodadPlacement {
+        std::string modelPath; // .wom path
+        glm::vec3 position;
+        glm::vec3 rotation;
+        float scale = 1.0f;
+    };
+
+    std::string name;
+    std::vector<Group> groups;
+    std::vector<Portal> portals;
+    std::vector<DoodadPlacement> doodads;
+    float boundRadius = 1.0f;
+
+    bool isValid() const { return !groups.empty(); }
+};
+
+class WoweeBuildingLoader {
+public:
+    static WoweeBuilding load(const std::string& basePath);
+    static bool save(const WoweeBuilding& building, const std::string& basePath);
+    static bool exists(const std::string& basePath);
+};
+
+} // namespace pipeline
+} // namespace wowee