Performance improvements with the help of Claude

[Mag-nus]

This has 5 minor performance improvements found with the help of Claude

In networking, check for packetLog.IsDebugEnabled before the calls.

• packetLog is disabled in almost all servers. This removes the boxing cost and GC pressure it adds for var/struct types with structured logging.
• Don't clear the array when its released back to the pool. We're not leaking any secrets here. It's an AC server. We can skip this cost.

Polygon walkable_hits_sphere included some test code that was ported over from the client. This code was likely code added to the client with a break point so that a developer could test if the two functions ever mismatched. Not needed for us.

Transition calls init in its ctor, no need to explicitly call it again. Saves re-creation of a few objects.

Creature_BodyPart and Monster_Melee referenced a few biota properties that were never used. Querying a property incurs a slight cost (lookups, rwLock, etc...)