Add drag-and-drop reordering to categories page

- Replace up/down chevron buttons with @dnd-kit drag handles
- Update pack generation and question review commands
- Fix MCP bridge and add supabase package.json for Docker

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/supabase/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "@sauci/supabase",
+  "version": "1.0.0",
+  "private": true
+}