Rebuild: fresh AdonisJS 7 API app on Postgres

The rebuild branch starts over (REBUILD.md): the API starter kit, with
Postgres instead of SQLite (its own database, DB_SEARCH_PATH for a
shared one in development) and the #lib alias. Phase 1's code is
imported from the current app module by module.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/nntp/xref.ts

@@ -1,13 +0,0 @@
-/**
- * Returns the group names from an Xref header,
- * e.g. `news.eweka.nl alt.binaries.test:123 alt.binaries.x:456`.
- */
-export function parseXrefGroups(xref: string | undefined): string[] {
-  if (!xref) return []
-  return xref
-    .trim()
-    .split(/\s+/)
-    .slice(1)
-    .map((entry) => entry.slice(0, entry.lastIndexOf(':')))
-    .filter(Boolean)
-}