Fix Stormwind cathedral LOD shell and extend view distance

- Add distance-based + backface culling for STORMWIND.WMO LOD shell groups
- Hide floating cathedral shell when within 185 units of group center
- Enable backface culling for LOD shell to reduce artifacts from inside
- Increase WMO view distance from 160 to 500 units for better visibility
- Extend fog distances to 3000-4000 units for clearer long-range views
- Add fog support to water renderer matching WMO fog settings

include/rendering/wmo_renderer.hpp

@@ -534,8 +534,8 @@ private:
 
     // Fog parameters
     glm::vec3 fogColor = glm::vec3(0.5f, 0.6f, 0.7f);
-    float fogStart = 400.0f;
-    float fogEnd = 1200.0f;
+    float fogStart = 3000.0f;   // Increased to allow clearer visibility at distance
+    float fogEnd = 4000.0f;    // Increased to match extended view distance
 
     // Shadow mapping
     GLuint shadowDepthTex = 0;