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/README.md

@@ -0,0 +1,60 @@
+# Blog App (Coop)
+
+Blog, authentication, and content management service for the Rose Ash cooperative platform. Handles Ghost CMS integration, user auth, and admin settings.
+
+## Architecture
+
+One of five Quart microservices sharing a single PostgreSQL database:
+
+| App | Port | Domain |
+|-----|------|--------|
+| **blog (coop)** | 8000 | Auth, blog, admin, menus, snippets |
+| market | 8001 | Product browsing, Suma scraping |
+| cart | 8002 | Shopping cart, checkout, orders |
+| events | 8003 | Calendars, bookings, tickets |
+| federation | 8004 | ActivityPub, fediverse social |
+
+## Structure
+
+```
+app.py                  # Application factory (create_base_app + blueprints)
+path_setup.py           # Adds project root + app dir to sys.path
+config/app-config.yaml  # App URLs, feature flags, SumUp config
+models/                 # Blog-domain models (+ re-export stubs for shared models)
+bp/                     # Blueprints
+  auth/                 #   Magic link login, account, newsletters
+  blog/                 #   Post listing, Ghost CMS sync
+  post/                 #   Single post view and admin
+  admin/                #   Settings admin interface
+  menu_items/           #   Navigation menu management
+  snippets/             #   Reusable content snippets
+templates/              # Jinja2 templates
+services/               # register_domain_services() — wires blog + calendar + market + cart
+shared/                 # Submodule -> git.rose-ash.com/coop/shared.git
+```
+
+## Cross-Domain Communication
+
+All inter-app communication uses typed service contracts (no HTTP APIs):
+
+- `services.calendar.*` — calendar/entry queries via CalendarService protocol
+- `services.market.*` — marketplace queries via MarketService protocol
+- `services.cart.*` — cart summary via CartService protocol
+- `services.federation.*` — AP publishing via FederationService protocol
+- `shared.services.navigation` — site navigation tree
+
+## Domain Events
+
+- `auth/routes.py` emits `user.logged_in` via `shared.events.emit_event`
+- Ghost sync emits `post.published` / `post.updated` for federation
+
+## Running
+
+```bash
+export DATABASE_URL_ASYNC=postgresql+asyncpg://user:pass@localhost/coop
+export REDIS_URL=redis://localhost:6379/0
+export SECRET_KEY=your-secret-key
+
+alembic -c shared/alembic.ini upgrade head
+hypercorn app:app --bind 0.0.0.0:8000
+```