[v0.0.7] Implement Deer NPC Entities

[jacuzzicoding]

Description

Implement deer as the first NPC entities in the game world. These should have basic AI behavior, interact with the environment, and serve as a foundation for future ecosystem development.

Requirements

• Create deer entity with appropriate components
• Implement basic AI for movement, grazing, and fleeing
• Add interaction with environmental objects (grass, trees)
• Create placeholder art assets for deer (can be simple shapes initially)
• Implement day/night behavior changes
• Add sound effects for deer

Technical Details

• New components needed:
  • AIComponent for behavior control
  • AnimalComponent for animal-specific properties
  • InteractionComponent for environmental interaction
• Systems changes:
  • Update EntityManager to handle AI entities
  • Create AISystem for processing AI behaviors
  • Extend collision system for AI entity interactions

Acceptance Criteria

• Deer spawn in appropriate locations in the world
• Deer move naturally with basic pathfinding
• Deer flee when player approaches too closely
• Deer graze on grass during the day
• Deer rest during night time
• Deer make appropriate sounds
• Deer interact with environmental objects
• Performance remains stable with multiple deer in the world