Rename coop to blog in app code and config

- App name: "coop" → "blog"
- coop_context() → blog_context()
- coop_url → blog_url imports
- app_url("coop") → app_url("blog")
- Config keys: coop_root/coop_title → market_root/market_title
- Sync shared submodule

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

bp/auth/routes.py

@@ -26,7 +26,7 @@ from shared.models import User, MagicLink, UserNewsletter
 from shared.models.ghost_membership_entities import GhostNewsletter
 from shared.config import config
 from shared.utils import host_url
-from shared.infrastructure.urls import coop_url
+from shared.infrastructure.urls import blog_url
 from shared.services.widget_registry import widgets
 
 from sqlalchemy.orm import selectinload
@@ -83,7 +83,7 @@ def register(url_prefix="/auth"):
         if cross_cart_sid:
             qsession["cart_sid"] = cross_cart_sid
         if g.get("user"):
-            return redirect(coop_url("/"))
+            return redirect(blog_url("/"))
         return await render_template("_types/auth/login.html")
 
 
@@ -346,6 +346,6 @@ def register(url_prefix="/auth"):
     @auth_bp.post("/logout/")
     async def logout():
         qsession.pop(SESSION_USER_KEY, None)
-        return redirect(coop_url("/"))
+        return redirect(blog_url("/"))
 
     return auth_bp