Initial federation app — ActivityPub server for Rose-Ash

Phase 0+1 of AP integration. New 5th Quart microservice:

Blueprints:
- wellknown: WebFinger, NodeInfo 2.0, host-meta
- actors: AP actor profiles (JSON-LD + HTML), outbox, inbox, followers
- identity: username selection flow (creates ActorProfile + RSA keypair)
- auth: magic link login/logout (ported from blog, self-contained)

Services:
- Registers SqlFederationService (real impl) for federation domain
- Registers real impls for blog, calendar, market, cart
- All cross-domain via shared service contracts

Templates:
- Actor profiles, username selection, platform home
- Auth login/check-email (ported from blog)

Infrastructure:
- Dockerfile + entrypoint.sh (matches other apps)
- CI/CD via Gitea Actions
- shared/ as git submodule

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

services/__init__.py

@@ -0,0 +1,27 @@
+"""Federation app service registration."""
+from __future__ import annotations
+
+
+def register_domain_services() -> None:
+    """Register services for the federation app.
+
+    Federation owns: ActorProfile, APActivity, APFollower, APInboxItem,
+    APAnchor, IPFSPin.
+    Standard deployment registers all services as real DB impls (shared DB).
+    """
+    from shared.services.registry import services
+    from shared.services.federation_impl import SqlFederationService
+    from shared.services.blog_impl import SqlBlogService
+    from shared.services.calendar_impl import SqlCalendarService
+    from shared.services.market_impl import SqlMarketService
+    from shared.services.cart_impl import SqlCartService
+
+    services.federation = SqlFederationService()
+    if not services.has("blog"):
+        services.blog = SqlBlogService()
+    if not services.has("calendar"):
+        services.calendar = SqlCalendarService()
+    if not services.has("market"):
+        services.market = SqlMarketService()
+    if not services.has("cart"):
+        services.cart = SqlCartService()