feat: restructure market app with per-market URL scoping

- URL structure changes from /<route> to /<market_slug>/<route>
- Root / shows markets listing page
- app.py: url_value_preprocessor, url_defaults, hydrate_market (events app pattern)
- Browse queries (db_nav, db_products_nocounts, db_products_counts) accept market_id
- _productInfo reads g.market.id to scope all queries
- save_nav accepts market_id, sets on new NavTop rows
- API save_nav passes g.market.id
- Scraper default URLs point to /suma-market/ on port 8001

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

bp/market/routes.py

@@ -22,10 +22,13 @@ def register(url_prefix, title):
   
   @bp.context_processor
   async def inject_root():
+    market = getattr(g, "market", None)
+    market_id = market.id if market else None
     return {
       "coop_title": title,
-      "categories": (await get_nav(g.s))["cats"],
+      "categories": (await get_nav(g.s, market_id=market_id))["cats"],
       "qs": makeqs_factory()(),
+      "market": market,
     }
 
   bp.register_blueprint(