Auto Sprint cancel prone

Platform: PC
Input: Keyboard & Mouse
Game Mode: All
Reproducible: 100%

Description:
When Auto-Sprint is enabled (any variant tied to forward movement),
going prone and attempting to move forward immediately forces the player
to stand up and enter sprint, making prone crawling impossible.

This makes Auto-Sprint unusable for players who rely on prone movement,
especially on PC with keyboard and mouse.

Steps to Reproduce:
1. Enable Auto-Sprint (forward movement based)
2. Move forward (sprint engages)
3. Go prone
4. Press forward key (W)

Actual Result:
Player stands up and enters sprint.

Expected Result:
Player remains prone and crawls forward.
Auto-Sprint should be temporarily disabled while in prone state,
and automatically re-enabled when standing up.

Why this matters:
This negatively impacts accessibility, tactical gameplay,
and competitive control consistency.
Other FPS games disable sprint automatically while prone.

Suggested Fix:
Add an option:
"Disable Auto-Sprint While Prone" (ON/OFF)

or

Auto-sprint should be ignored when player posture = prone.