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/stickers.py

@@ -0,0 +1,30 @@
+
+from __future__ import annotations
+from typing import Dict, List
+from bs4 import BeautifulSoup
+from ..registry import extractor
+
+@extractor
+def ex_stickers(soup: BeautifulSoup, url: str) -> Dict:
+    """
+    <div class="stickers">
+      <span class="sticker xxx"></span>
+      ...
+    </div>
+    """
+    root = soup.select_one("div.stickers")
+    if not root:
+        return {"stickers": []}
+    stickers: List[str] = []
+    seen = set()
+    for sp in root.select("span.sticker"):
+        classes = sp.get("class") or []
+        extras = [c.strip() for c in classes if c and c.lower() != "sticker"]
+        data_name = (sp.get("data-sticker") or "").strip()
+        if data_name:
+            extras.append(data_name)
+        for x in extras:
+            if x and x not in seen:
+                seen.add(x)
+                stickers.append(x)
+    return {"stickers": stickers}