Implement unit spawning from main base

Objective

Create unit production system that allows bases to spawn units automatically for MVP gameplay, providing foundation for combat scenarios.

Requirements

• Auto Production: Main bases periodically produce basic units
• Resource Cost: Unit production consumes appropriate resources
• Spawn Logic: Units appear near base without overlapping
• Ownership: Units are properly assigned to player/AI that created them

Technical Details

• Implement unit spawning queues and timers
• Add spawn point management around bases
• Create unit ownership and faction assignment
• Handle resource deduction for unit costs
• Add spawn collision detection
• Implement production rate configuration

Acceptance Criteria

• Units spawn automatically from player and AI bases
• Unit production costs resources appropriately
• Units spawn without overlapping existing entities
• Spawned units are assigned correct ownership
• Production rate is configurable and balanced

Milestone Relation

Core gameplay mechanic for MVP. Required for establishing basic combat forces and enabling player vs AI battles.