feat: Add spawn position caching and spiral scan optimization (#2295)

### Summary

Adds spawn position caching and optimization for constrained spawners (e.g., those near houses, water, or blocked terrain).

### Key features:
- Sector-based bitmap cache (32 bytes per 16x16 sector) stores valid spawn positions
- Spiral scan progressively discovers positions from spawner center outward
- Automatic mode detects constrained spawners after 5+ non-transient failures
- Prevents mob spawning inside private houses (allows public AoS buildings)
- Deduplicates sector lookups for multi-bounds spawners (RegionSpawner)
- Cache invalidation on house placement/demolition
- Moves SpawnBounds to Spawner

### New spawner properties:
- SpawnPositionMode: Automatic (default), Enabled, Disabled, Abandoned
- MaxSpawnAttempts: Configurable attempts before optimization engages (default: 5)

Projects/UOContent/Commands/Generic/Commands/Commands.cs

@@ -1199,7 +1199,7 @@ namespace Server.Commands.Generic
                     {
                         CommandLogging.WriteLine(
                             from,
-                            $"{from.AccessLevel} {CommandLogging.Format(from)} {(m_Ban ? "banning" : "kicking")} {(CommandLogging.Format(targ))}"
+                            $"{from.AccessLevel} {CommandLogging.Format(from)} {(m_Ban ? "banning" : "kicking")} {CommandLogging.Format(targ)}"
                         );
 
                         targ.Say(m_Ban ? "I've been banned." : "I've been kicked");