Pasture: NodeBB joins

NodeBB 4.16.1 runs in the pasture on the pasture's Mongo, set up by its
automated setup, with an API token written where NodeBB keeps them.
scenarios/nodebb.sh passes its 23 checks with no change to PrivaPub: a
category followed and its topic as a titled thread, replies both ways, a
follow of alice and her post there, votes both ways, an edit and a
deletion, a chat both ways, the unfollow and statistics.

NodeBB never federates a topic's lock, and its API follows an account
elsewhere only when named by its handle; both are in docs/INTEROP.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

tools/pasture/Caddyfile

@@ -102,3 +102,8 @@ mbin.test {
 	tls internal
 	reverse_proxy pasture-mbin:80
 }
+
+nodebb.test {
+	tls internal
+	reverse_proxy pasture-nodebb:4567
+}