Camera controller / sitting:
- Any movement key (WASD/QE/Space) pressed while sitting now clears the
sitting flag immediately, matching WoW's sit-to-stand-on-move behaviour
- Added StandUpCallback: when the player stands up via local input the
callback fires setStandState(0) → CMSG_STAND_STATE_CHANGE(STAND) so
the server releases the sit lock and restores normal movement
- Fixes character getting stuck in sit state after accidentally
right-clicking a chair GO in Goldshire Inn (or similar)
Nameplates:
- Use getRenderPositionForGuid() (renderer visual position) as primary
source for nameplate anchor, falling back to entity X/Y/Z only when
no render instance exists yet; keeps health bars in sync with the
rendered model instead of the parallel entity interpolator
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