Improve runtime stutter handling and ground clutter performance

- reduce per-tile ground clutter generation pressure and enforce tighter caps to avoid spikes

- remove expensive detail dedupe scans from the hot render path

- add progressive/lazy clutter updates around player movement to smooth frame pacing

- lower noisy runtime INFO logging to DEBUG/throttled paths

- keep terrain/game screen updates responsive while preserving existing behavior

include/rendering/m2_renderer.hpp

@@ -65,6 +65,7 @@ struct M2ModelGPU {
     bool collisionStatue = false;
     bool isSmallFoliage = false;  // Small foliage (bushes, grass, plants) - skip during taxi
     bool isInvisibleTrap = false; // Invisible trap objects (don't render, no collision)
+    bool isGroundDetail = false;  // Ground clutter/detail doodads (special fallback render path)
 
     // Collision mesh with spatial grid (from M2 bounding geometry)
     struct CollisionMesh {