Add WoW-style camera system with collision and first-person mode

- Implement orbit camera with smooth zoom and collision detection
- Add 50° slope limiting with sliding (prevents mountain climbing)
- Add first-person mode that hides player model and weapons
- Add floor clearance check to prevent camera clipping through ground
- Improve WMO wall collision with proper height range checks
- Add two-sided floor collision detection for WMO geometry
- Increase M2 render distance slightly for better visibility

src/core/application.cpp

@@ -939,7 +939,7 @@ void Application::spawnPlayerCharacter() {
     // Spawn character at camera's ground position
     glm::vec3 spawnPos = camera->getPosition() - glm::vec3(0.0f, 0.0f, 5.0f);
     uint32_t instanceId = charRenderer->createInstance(1, spawnPos,
-        glm::vec3(0.0f), 2.0f);
+        glm::vec3(0.0f), 1.0f);  // Scale 1.0 = normal WoW character size
 
     if (instanceId > 0) {
         // Set up third-person follow
@@ -974,6 +974,11 @@ void Application::spawnPlayerCharacter() {
                 static_cast<int>(spawnPos.z), ")");
         playerCharacterSpawned = true;
 
+        // Set up camera controller for first-person player hiding
+        if (renderer->getCameraController()) {
+            renderer->getCameraController()->setCharacterRenderer(charRenderer, instanceId);
+        }
+
         // Load equipped weapons (sword + shield)
         loadEquippedWeapons();
     }