Add xref support, assembly/component views, and import tooling

- add_xref.php, edit_xref.php: xref record add/edit for stock content types
- admin xref group/source pages for stock_assembly and stock_component
- assembly_views/: auto_flow, fixed_grid, position_number, simple_list layouts
- Full assembly and component listing, tree, ordering, and detail pages
- Import tooling (ImportAssembly, ImportComponent, load scripts)
- liberty_plugins for assembly and component data types
- schema_inc.php updated; StockAssembly, StockBase, StockComponent,
  StockMovement classes updated with xref group/item/multiple renames
- Templates updated throughout for xref rename (source→item, group→x_group)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/index.php b/index.php
index fbe3832..96e28dd 100755
--- a/index.php
+++ b/index.php
@@ -1,2 +1,2 @@
 <?php
-require_once 'list_galleries.php';
+require_once 'list_assemblies.php';