Extract bevy-combat as standalone crate for crates.io

[jbdevprimary]

Summary

Extract the game-combat crate as a standalone library for crates.io.

Current Functionality (~1,500 LOC)

• Damage calculation systems
• Effect stacking and management
• XP and leveling systems
• Combat state management
• Physics integration with Rapier3D
• Visual effects for combat

Proposed Crate Name

bevy-combat

Tasks

1. Create new repository rust-bevy-combat in jbcom org
2. Extract crate with documentation
3. Make physics optional via features
4. Add examples
5. Publish to crates.io

Crates.io Metadata

[package]
name = "bevy-combat"
description = "Combat systems for Bevy games - damage, effects, XP, physics"
keywords = ["bevy", "gamedev", "combat", "rpg", "rts"]
categories = ["game-development"]