Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@indra/newview/llaisapi.cpp`:
- Around line 1748-1757: Throttle the deferred inventory notifications so they
are posted once per batch instead of once for every overflowed item. In the
inventory fetch/update path around gInventory.notifyObservers() and the
category-create path, add a guard or pending flag so repeated iterations while
mChangedItemIDs remains above MAX_UPDATE_BACKLOG do not queue duplicate
postToMainCoro callbacks. Make sure the same batching logic is applied
consistently in both places that currently defer notifyObservers().
- Around line 1683-1692: The backlog refresh logic in the inventory checks is
repeatedly posting notifyObservers() because deferred execution leaves
gInventory.getChangedIDs().size() above MAX_UPDATE_BACKLOG until the main loop
runs. Add a single pending-refresh/coalescing flag around the backlog paths in
llAisApi so only one deferred inventory refresh can be queued at a time, and
clear that flag when the posted callback runs and notifyObservers() completes.
Apply the same guard to both backlog checks in llAisApi to preserve throttling
and prevent gMainloopWork from being flooded.