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)

blog/bp/post/services/markets.py

@@ -0,0 +1,61 @@
+from __future__ import annotations
+
+import re
+import unicodedata
+
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from shared.models.page_config import PageConfig
+from shared.contracts.dtos import MarketPlaceDTO
+from shared.services.registry import services
+
+
+class MarketError(ValueError):
+    """Base error for market service operations."""
+
+
+def slugify(value: str, max_len: int = 255) -> str:
+    if value is None:
+        value = ""
+    value = unicodedata.normalize("NFKD", value)
+    value = value.encode("ascii", "ignore").decode("ascii")
+    value = value.lower()
+    value = value.replace("/", "-")
+    value = re.sub(r"[^a-z0-9]+", "-", value)
+    value = re.sub(r"-{2,}", "-", value)
+    value = value.strip("-")[:max_len].strip("-")
+    return value or "market"
+
+
+async def create_market(sess: AsyncSession, post_id: int, name: str) -> MarketPlaceDTO:
+    name = (name or "").strip()
+    if not name:
+        raise MarketError("Market name must not be empty.")
+    slug = slugify(name)
+
+    post = await services.blog.get_post_by_id(sess, post_id)
+    if not post:
+        raise MarketError(f"Post {post_id} does not exist.")
+
+    if not post.is_page:
+        raise MarketError("Markets can only be created on pages, not posts.")
+
+    pc = (await sess.execute(
+        select(PageConfig).where(PageConfig.container_type == "page", PageConfig.container_id == post_id)
+    )).scalar_one_or_none()
+    if pc is None or not (pc.features or {}).get("market"):
+        raise MarketError("Market feature is not enabled for this page. Enable it in page settings first.")
+
+    try:
+        return await services.market.create_marketplace(sess, "page", post_id, name, slug)
+    except ValueError as e:
+        raise MarketError(str(e)) from e
+
+
+async def soft_delete_market(sess: AsyncSession, post_slug: str, market_slug: str) -> bool:
+    post = await services.blog.get_post_by_slug(sess, post_slug)
+    if not post:
+        return False
+
+    return await services.market.soft_delete_marketplace(sess, "page", post.id, market_slug)