feat: initialize market app with browsing, product, and scraping code

Split from coop monolith. Includes:
- Market/browse/product blueprints
- Product sync API
- Suma scraping pipeline
- Templates for market, browse, and product views
- Dockerfile and CI workflow for independent deployment

bp/browse/__init__.py

@@ -0,0 +1,7 @@
+from __future__ import annotations
+
+# create the blueprint at package import time
+from .routes import register # = Blueprint("browse_bp", __name__)
+
+# import routes AFTER browse_bp is defined so routes can attach to it
+from . import routes  # noqa: F401