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

scrape/product/extractors/breadcrumbs.py

@@ -0,0 +1,68 @@
+
+from __future__ import annotations
+from typing import Dict, List, Union
+from urllib.parse import urlparse
+from bs4 import BeautifulSoup
+from utils import normalize_text
+from ..registry import extractor
+
+@extractor
+def ex_breadcrumbs(soup: BeautifulSoup, url: str) -> Dict:
+    """
+    Parse breadcrumbs to identify top and sub categories.
+    """
+    bc_ul = (soup.select_one(".breadcrumbs ul.items")
+             or soup.select_one("nav.breadcrumbs ul.items")
+             or soup.select_one("ul.items"))
+    if not bc_ul:
+        return {}
+
+    crumbs = []
+    for li in bc_ul.select("li.item"):
+        a = li.find("a")
+        if a:
+            title = normalize_text(a.get("title") or a.get_text())
+            href = a.get("href")
+        else:
+            title = normalize_text(li.get_text())
+            href = None
+        slug = None
+        if href:
+            try:
+                p = urlparse(href)
+                path = (p.path or "").strip("/")
+                slug = path.split("/")[-1] if path else None
+            except Exception:
+                slug = None
+        if slug:
+          crumbs.append({"title": title or None, "href": href or None, "slug": slug})
+
+    category_links = [c for c in crumbs if c.get("href")]
+    top = None
+    sub = None
+    for c in category_links:
+        t = (c.get("title") or "").lower()
+        s = (c.get("slug") or "").lower()
+        if t == "home" or s in ("", "home"):
+            continue
+        if top is None:
+            top = c
+            continue
+        if sub is None:
+            sub = c
+            break
+
+    out: Dict[str, Union[str, List[Dict[str, str]]]] = {
+        "category_breadcrumbs": crumbs
+    }
+    if top:
+        out["category_top_title"] = top.get("title")
+        out["category_top_href"] = top.get("href")
+        out["category_top_slug"] = top.get("slug")
+    if sub:
+        out["category_sub_title"] = sub.get("title")
+        out["category_sub_href"] = sub.get("href")
+        out["category_sub_slug"] = sub.get("slug")
+    if top and sub:
+        out["category_path"] = f"{(top.get('slug') or '').strip()}/{(sub.get('slug') or '').strip()}"
+    return out