Fix /unstuckgy hang by skipping WMO floor search

Add CameraController::teleportTo() that directly places the player at
the target position without the expensive floor-search loop in reset().
The loop does hundreds of WMO collision checks which hangs in cities.

include/rendering/camera_controller.hpp

@@ -42,6 +42,7 @@ public:
     }
 
     void reset();
+    void teleportTo(const glm::vec3& pos);
     void setOnlineMode(bool online) { onlineMode = online; }
     void startIntroPan(float durationSec = 2.8f, float orbitDegrees = 140.0f);
     bool isIntroActive() const { return introActive; }