Monorepo: consolidate 7 repos into one

Combines shared, blog, market, cart, events, federation, and account
into a single repository. Eliminates submodule sync, sibling model
copying at build time, and per-app CI orchestration.

Changes:
- Remove per-app .git, .gitmodules, .gitea, submodule shared/ dirs
- Remove stale sibling model copies from each app
- Update all 6 Dockerfiles for monorepo build context (root = .)
- Add build directives to docker-compose.yml
- Add single .gitea/workflows/ci.yml with change detection
- Add .dockerignore for monorepo build context
- Create __init__.py for federation and account (cross-app imports)

market/bp/browse/services/blacklist/category.py

@@ -0,0 +1,12 @@
+# suma_browser/category_blacklist.py
+from __future__ import annotations
+from typing import Optional
+from shared.config import config
+
+def _norm(s: str) -> str:
+    return (s or "").strip().lower().strip("/")
+
+def is_category_blocked(top_slug: str, sub_slug: Optional[str] = None) -> bool:
+    if sub_slug:
+        return is_category_blocked(top_slug) or _norm(f"{top_slug}/{sub_slug}") in config()["blacklist"]["category"]
+    return _norm(top_slug) in config()["blacklist"]["category"]

market/bp/browse/services/blacklist/product.py

@@ -0,0 +1,15 @@
+from typing import Set, Optional
+from ..slugs import canonical_html_slug
+from shared.config import config
+
+_blocked: Set[str] = set()
+_mtime: Optional[float] = None
+
+def _norm(slug: str) -> str:
+    slug = (slug or "").strip().strip("/").lower()
+    if slug.startswith("product/"):
+        slug = slug.split("/", 1)[1]
+    return canonical_html_slug(slug)
+
+def is_product_blocked(slug: str) -> bool:
+    return _norm(slug) in config()["blacklist"]["product"]

market/bp/browse/services/blacklist/product_details.py

@@ -0,0 +1,11 @@
+import re
+from shared.config import config
+
+def _norm_title_key(t: str) -> str:
+    t = (t or "").strip().lower()
+    t = re.sub(r":\s*$", "", t)
+    t = re.sub(r"\s+", " ", t)
+    return t
+
+def is_blacklisted_heading(title: str) -> bool:
+    return _norm_title_key(title) in  [s.lower() for s in config()["blacklist"]["product-details"]]