refactor: use BedSim as the movement physics oracle

[HashimTheArab]

Goal

Make BedSim the single deterministic player-physics oracle used by Oomph's authoritative movement path.

Keep in Oomph

• PlayerAuthInput decoding and per-tick ordering.
• Simulation-frame, latency, deduplication, and acknowledgement handling.
• Correction policy, CorrectPlayerMovePrediction, teleport handling, and rewind/replay.
• Server event ingestion: attributes, effects, equipment, SetActorMotion, knockback, vehicles, and world updates.
• Adapter logic that converts Oomph state into BedSim inputs and applies the result back to the player.

Work

• Build an adapter for the complete BedSim input/state contract.
• Feed consistent world snapshots, liquid layers, dynamic collision shapes, and entity shapes.
• Move any remaining pure movement formulas out of Oomph's duplicate simulator.
• Preserve Oomph's authority, latency, correction, and anti-cheat policy outside BedSim.
• Add replay/correction tests proving the adapter produces the same result as direct BedSim simulation.
• Remove or quarantine duplicate physics paths once the adapter is authoritative.

Boundary

BedSim owns physics. Oomph owns packets, authority, history, corrections, and policy.