Add glue layer: replace /internal/menu-items API with direct DB query

- Context processor: get_navigation_tree() replaces api_get("coop", "/internal/menu-items")
- Add glue submodule

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

.gitmodules

@@ -2,3 +2,6 @@
 	path = shared
 	url = https://git.rose-ash.com/coop/shared.git
 	branch = decoupling
+[submodule "glue"]
+	path = glue
+	url = /root/rose-ash/glue

app.py

@@ -40,13 +40,13 @@ async def cart_context() -> dict:
     - cart / calendar_cart_entries / total / calendar_total: direct DB
       (cart app owns this data)
     - cart_count: derived from cart + calendar entries (for _mini.html)
-    - menu_items: fetched from coop internal API
+    - menu_items: direct DB query via glue layer
 
     When g.page_post exists, cart and calendar_cart_entries are page-scoped.
     Global cart_count / cart_total stay global for cart-mini.
     """
     from shared.infrastructure.context import base_context
-    from shared.infrastructure.internal_api import get as api_get, dictobj
+    from glue.services.navigation import get_navigation_tree
 
     ctx = await base_context()
 
@@ -75,9 +75,7 @@ async def cart_context() -> dict:
     ctx["total"] = total
     ctx["calendar_total"] = calendar_total
 
-    # Menu items from coop API (wrapped for attribute access in templates)
-    menu_data = await api_get("coop", "/internal/menu-items")
-    ctx["menu_items"] = dictobj(menu_data) if menu_data else []
+    ctx["menu_items"] = await get_navigation_tree(g.s)
 
     return ctx