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>

config/app-config.yaml

@@ -3,13 +3,13 @@ base_host: "wholesale.suma.coop"
 base_login: https://wholesale.suma.coop/customer/account/login/
 base_url: https://wholesale.suma.coop/
 title: Rose Ash
-coop_root: /market
-coop_title: Market
+market_root: /market
+market_title: Market
 blog_root: /
 blog_title: all the news
 cart_root: /cart
 app_urls:
-  coop: "http://localhost:8000"
+  blog: "http://localhost:8000"
   market: "http://localhost:8001"
   cart: "http://localhost:8002"
   events: "http://localhost:8003"