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/services/slugs.py

@@ -0,0 +1,24 @@
+import re
+from urllib.parse import urljoin, urlparse
+from config import config
+
+def product_slug_from_href(href: str) -> str:
+    p = urlparse(href)
+    parts = [x for x in p.path.split("/") if x]
+    if not parts:
+        return ""
+    last = parts[-1]
+    if last.endswith(".html"):
+        last = last[:-5]
+    elif last.endswith(".htm"):
+        last = last[:-4]
+    last = re.sub(r"-(html|htm)+$", "", last, flags=re.I)
+    return f"{last}-html"
+
+def canonical_html_slug(slug: str) -> str:
+    base = re.sub(r"-(html|htm)+$", "", slug, flags=re.I)
+    return f"{base}-html"
+
+def suma_href_from_html_slug(slug: str) -> str:
+    canon = canonical_html_slug(slug)
+    return urljoin(config()["base_url"], f"/{canon}.html")