Camp: reject (not downgrade) sub-par camps; map: show visited path

Camp rest rules:
  • Standard camp now rejects an uncleared room with a clear message
    instead of silently downgrading to rough — let the player make the
    call rather than spending supplies on a worse rest they didn't pick.
  • campLocationCheck treats a room with a resolved (non-active) combat
    session as cleared, so the natural "just killed, not yet advanced"
    pause still qualifies for a standard camp.
  • Reword fortified-camp gating + babysit help to "zone boss defeated"
    (cache sites aren't a thing yet) so the requirement isn't misleading.

Map: renderVisitedPath adds a 1-indexed breadcrumb of visited rooms to
!expedition map, so players can reference rooms by index (e.g. !revisit 2).

(cherry picked from commit a38fc77eed888e9790c7a7cff24369b98910b43e)

internal/plugin/adventure_babysit.go

@@ -98,7 +98,7 @@ func (p *AdventurePlugin) handleBabysitCmd(ctx MessageContext, args string) erro
 		return p.SendDM(ctx.Sender, "🍼 **Adventurer Babysitting Service**\n\n"+
 			"Hire a babysitter to look after your camp and tend the pet while you sleep:\n"+
 			"  • Daily pet XP trickle (your pet still grows while you focus elsewhere)\n"+
-			"  • Standard camps act like fortified ones — rest deeply, no need for boss-cleared rooms\n"+
+			"  • Standard camps act like fortified ones — rest deeply, no need to have downed the zone boss\n"+
 			"  • Rival duels declined on your behalf\n\n"+
 			"`!adventure babysit week` — 7 days of service\n"+
 			"`!adventure babysit month` — 30 days of service\n"+