Add pre-computed WMO floor cache and improve save logging

- Add initial floor cache for faster collision on first run
- Log absolute path when saving cache for debugging

src/core/application.cpp

@@ -317,8 +317,12 @@ void Application::shutdown() {
 
     // Save floor cache before renderer is destroyed
     if (renderer && renderer->getWMORenderer()) {
+        size_t cacheSize = renderer->getWMORenderer()->getFloorCacheSize();
+        if (cacheSize > 0) {
+            LOG_INFO("Saving WMO floor cache (", cacheSize, " entries)...");
             renderer->getWMORenderer()->saveFloorCache("cache/wmo_floor_cache.bin");
         }
+    }
 
     // Stop renderer first: terrain streaming workers may still be reading via
     // AssetManager during shutdown, so renderer/terrain teardown must complete

src/rendering/wmo_renderer.cpp

@@ -517,8 +517,15 @@ void WMORenderer::resetQueryStats() {
 bool WMORenderer::saveFloorCache(const std::string& filepath) const {
     // Create directory if needed
     std::filesystem::path path(filepath);
+    std::filesystem::path absPath = std::filesystem::absolute(path);
+    core::Logger::getInstance().info("Saving floor cache to: ", absPath.string());
+
     if (path.has_parent_path()) {
-        std::filesystem::create_directories(path.parent_path());
+        std::error_code ec;
+        std::filesystem::create_directories(path.parent_path(), ec);
+        if (ec) {
+            core::Logger::getInstance().error("Failed to create cache directory: ", ec.message());
+        }
     }
 
     std::ofstream file(filepath, std::ios::binary);