NPCScriptManager

Wires EliteMobs NPC Lua scripts into Magmacore's shared LuaEngine.

NPC scripts now run on the same scripting runtime as FreeMinecraftModels props and EliteMobs bosses, so they inherit every Magmacore primitive (context.world incl. strike_lightning, zones, scheduler, cooldowns, log, ...) automatically. This replaces the old self-contained NPC Lua engine that only exposed a handful of NPC-specific helpers.