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/state.py

@@ -0,0 +1,21 @@
+from typing import Dict, Tuple, List
+import time
+
+_nav_cache: dict = {}
+_nav_cache_ts: float = 0.0
+_nav_ttl_seconds = 60 * 60 * 6
+
+_detail_cache: Dict[str, Dict] = {}
+_detail_cache_ts: Dict[str, float] = {}
+_detail_ttl_seconds = 60 * 60 * 6
+
+KNOWN_PRODUCT_SLUGS: set[str] = set()
+
+_listing_variant_cache: Dict[str, Tuple[str, float]] = {}
+_listing_variant_ttl = 60 * 60 * 6
+
+_listing_page_cache: Dict[str, Tuple[Tuple[List[Dict], int], float]] = {}
+_listing_page_ttl = 60 * 30
+
+def now() -> float:
+    return time.time()