Performance optimizations and collision improvements

Performance:
- Remove expensive inverse() from all vertex shaders (terrain, WMO, M2, water, character)
- Add uniform location caching to avoid repeated glGetUniformLocation calls
- Add proper frustum culling for WMO groups using AABB intersection
- Add distance-based culling for WMO and M2 instances
- Add cleanup of unused M2/WMO models when tiles unload

Collision & Movement:
- Add M2 doodad collision detection (fences, boxes, etc.)
- Reduce character eye height (5.0 -> 1.8) and collision radius (2.5 -> 0.5)
- Enable WoW-style movement speed by default (14 units/sec run, 5 walk, 9 back)
- Fix emote grammar ("You waves." -> "You wave.")

Misc:
- Rename window title to "Wowee"

src/rendering/renderer.cpp

@@ -84,7 +84,7 @@ bool Renderer::initialize(core::Window* win) {
 
     // Create camera controller
     cameraController = std::make_unique<CameraController>(camera.get());
-    cameraController->setMovementSpeed(100.0f);  // Fast movement for terrain exploration
+    cameraController->setUseWoWSpeed(true);  // Use realistic WoW movement speed
     cameraController->setMouseSensitivity(0.15f);
 
     // Create scene
@@ -767,6 +767,9 @@ bool Renderer::loadTestTerrain(pipeline::AssetManager* assetManager, const std::
             if (wmoRenderer) {
                 cameraController->setWMORenderer(wmoRenderer.get());
             }
+            if (m2Renderer) {
+                cameraController->setM2Renderer(m2Renderer.get());
+            }
             if (waterRenderer) {
                 cameraController->setWaterRenderer(waterRenderer.get());
             }
@@ -876,10 +879,13 @@ bool Renderer::loadTerrainArea(const std::string& mapName, int centerX, int cent
         }
     }
 
-    // Wire WMO and water renderer to camera controller
+    // Wire WMO, M2, and water renderer to camera controller
     if (cameraController && wmoRenderer) {
         cameraController->setWMORenderer(wmoRenderer.get());
     }
+    if (cameraController && m2Renderer) {
+        cameraController->setM2Renderer(m2Renderer.get());
+    }
     if (cameraController && waterRenderer) {
         cameraController->setWaterRenderer(waterRenderer.get());
     }