Players can now spawn from factories

[Copilot]

Enables player spawning from factory entities in addition to default spawn locations.

Changes

• Factory spawn integration: Added factorySpawn chance mechanism (5% probability) when factories exist on the map
• Random positioning utility: Extracted getRandomPosition() to shared util for reuse across spawn systems
• Team assignment fixes: Corrected base locations for 4-team mode and maze wall team handling
• Admin controls: Added broadcast message function and fun command for testing
• Stability improvements: Fixed crashes related to entity cleanup, color updates, and null safety checks
• Performance: Optimized AI tick rate

Implementation

Players now have a chance to spawn from an existing factory entity:

// On spawn, check for factory spawn possibility
if (Math.random() < 0.05 && factoriesExist) {
  spawnFromRandomFactory();
} else {
  spawnAtDefaultLocation();
}

The spawn location selection uses the new shared getRandomPosition() utility that ensures valid positioning within arena bounds.

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