Add NPC/monster spawn browser with map and monster names to webtools

Map names now come from LIST_ZONE.STB (row index = map id, matching
CWorldServer::LoadZoneData). New NPCs tab lists all placed NPCs from
list_npcs with coordinates; new Monsters tab lists all 1,193 named montypes
from LIST_NPC.STB. Both are click-to-copy GM commands (/tele, /mon) for
quick GM navigation/spawning.

webtools/npcs.json

@@ -0,0 +1 @@
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