Fix instance portals: WDT byte order, box trigger sizing, suppress ping-pong, WMO cache cleanup

- Fix WDT chunk magic constants to big-endian ASCII (matching ADTLoader)
- Add minimum effective size for box area triggers (90 units, like sphere 45-unit radius)
- Add areaTriggerSuppressFirst_ flag to prevent portal ping-pong on map transfer
- Add WMORenderer::clearAll() to clear models/textures on map change (prevents GPU crash)
- Increase WMO texture cache default to 8GB
- Fix setMapName called after loadTestTerrain so WMO renderer exists
- Save/restore player position around CMSG_AREATRIGGER to prevent bad DB persistence

include/rendering/wmo_renderer.hpp

@@ -136,6 +136,11 @@ public:
      */
     void clearInstances();
 
+    /**
+     * Clear all instances, loaded models, and texture cache (for map transitions)
+     */
+    void clearAll();
+
     /**
      * Render all WMO instances (Vulkan)
      * @param cmd Command buffer to record into
@@ -630,7 +635,7 @@ private:
     std::unordered_map<std::string, TextureCacheEntry> textureCache;
     size_t textureCacheBytes_ = 0;
     uint64_t textureCacheCounter_ = 0;
-    size_t textureCacheBudgetBytes_ = 2048ull * 1024 * 1024;  // Default, overridden at init
+    size_t textureCacheBudgetBytes_ = 8192ull * 1024 * 1024;  // 8 GB default, overridden at init
     std::unordered_set<std::string> failedTextureCache_;
     std::unordered_set<std::string> loggedTextureLoadFails_;
     uint32_t textureBudgetRejectWarnings_ = 0;