feat(14.2.1-05): cover mlmarkdown, child adopt, and regen admin artifacts

MLMarkdownField and relation-child forms share the enabled-locale
inject and adopt merge; OpenAPI, types, docs, and boardwalk dist match.

Co-authored-by: Cursor <cursoragent@cursor.com>

modules/cabana/http.go

@@ -527,6 +527,9 @@ func (s *service) relationSchema(w http.ResponseWriter, r *http.Request) {
 		if locale := schemaLocale(r.Context(), tr); locale != "" {
 			meta["locale"] = locale
 		}
+		if codes := s.enabledContentLocales(r.Context()); len(codes) > 0 {
+			meta["enabledLocales"] = append([]string(nil), codes...)
+		}
 		WriteData(w, http.StatusOK, view, meta)
 	})
 }