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

src/pipeline/asset_manager.cpp

@@ -222,7 +222,9 @@ std::shared_ptr<DBCFile> AssetManager::loadDBC(const std::string& name) {
         (name == "CreatureDisplayInfo.dbc" ||
          name == "CreatureDisplayInfoExtra.dbc" ||
          name == "ItemDisplayInfo.dbc" ||
-         name == "CreatureModelData.dbc");
+         name == "CreatureModelData.dbc" ||
+         name == "GroundEffectTexture.dbc" ||
+         name == "GroundEffectDoodad.dbc");
 
     // Try expansion-specific CSV first (e.g. Data/expansions/wotlk/db/Spell.csv)
     bool loadedFromCSV = false;