Add pathfinding for unit movement to enemy base

Objective

Implement pathfinding system that enables units to navigate from their spawn point to enemy bases while avoiding obstacles.

Requirements

• Intelligent Navigation: Units find optimal paths around obstacles
• Dynamic Pathfinding: Handle moving obstacles and changing terrain
• Performance: Efficient pathfinding for multiple units simultaneously
• Target-oriented: Units consistently move toward enemy base

Technical Details

• Implement A* or similar pathfinding algorithm
• Create navigation mesh or grid-based pathfinding
• Add obstacle avoidance and collision handling
• Optimize pathfinding performance for real-time use
• Handle group movement and unit formations
• Add pathfinding caching and optimization

Acceptance Criteria

• Units find valid paths to enemy bases
• Pathfinding avoids obstacles and terrain barriers
• Multiple units can pathfind simultaneously without performance issues
• Units handle dynamic obstacles and changing paths
• Pathfinding is visually smooth and natural

Milestone Relation

Critical for MVP unit movement. Enables basic combat by allowing units to reach their targets and engage in battles.