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/camera_controller.cpp

@@ -1,6 +1,7 @@
 #include "rendering/camera_controller.hpp"
 #include "rendering/terrain_manager.hpp"
 #include "rendering/wmo_renderer.hpp"
+#include "rendering/m2_renderer.hpp"
 #include "rendering/water_renderer.hpp"
 #include "game/opcodes.hpp"
 #include "core/logger.hpp"
@@ -152,7 +153,7 @@ void CameraController::update(float deltaTime) {
             targetPos.z += verticalVelocity * deltaTime;
         }
 
-        // Wall collision for character
+        // Wall collision for character (WMO buildings)
         if (wmoRenderer) {
             glm::vec3 feetPos = targetPos;
             glm::vec3 oldFeetPos = *followTarget;
@@ -164,6 +165,15 @@ void CameraController::update(float deltaTime) {
             }
         }
 
+        // Collision with M2 doodads (fences, boxes, etc.)
+        if (m2Renderer) {
+            glm::vec3 adjusted;
+            if (m2Renderer->checkCollision(*followTarget, targetPos, adjusted)) {
+                targetPos.x = adjusted.x;
+                targetPos.y = adjusted.y;
+            }
+        }
+
         // Ground the character to terrain or WMO floor
         {
             std::optional<float> terrainH;