feat: show markets in post nav bar and admin panel

- Post context processor loads MarketPlace rows for the page
- Nav bar displays market links (shopping-bag icon) alongside calendars
- Admin panel includes markets CRUD when market feature is enabled
- Updated shared_lib submodule with nav_entries template change

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

bp/post/routes.py

@@ -12,6 +12,7 @@ from quart import (
 from .services.post_data import post_data
 from .services.post_operations import toggle_post_like
 from models.calendars import Calendar
+from models.market_place import MarketPlace
 from sqlalchemy import select
 
 from suma_browser.app.redis_cacher import cache_page, clear_cache
@@ -74,6 +75,14 @@ def register():
               )
           ).scalars().all()
 
+          markets = (
+              await g.s.execute(
+                  select(MarketPlace)
+                  .where(MarketPlace.post_id == db_post_id, MarketPlace.deleted_at.is_(None))
+                  .order_by(MarketPlace.name.asc())
+              )
+          ).scalars().all()
+
           # Fetch associated entries for nav display
           associated_entries = await get_associated_entries(g.s, db_post_id)
 
@@ -81,6 +90,7 @@ def register():
               **p_data,
               "base_title": f"{config()['title']} {p_data['post']['title']}",
               "calendars": calendars,
+              "markets": markets,
               "associated_entries": associated_entries,
           }
       else: