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>

bp/auth/services/__init__.py

@@ -0,0 +1,24 @@
+from .login_redirect import pop_login_redirect_target, store_login_redirect_target
+from .auth_operations import (
+    get_app_host,
+    get_app_root,
+    send_magic_email,
+    load_user_by_id,
+    find_or_create_user,
+    create_magic_link,
+    validate_magic_link,
+    validate_email,
+)
+
+__all__ = [
+    "pop_login_redirect_target",
+    "store_login_redirect_target",
+    "get_app_host",
+    "get_app_root",
+    "send_magic_email",
+    "load_user_by_id",
+    "find_or_create_user",
+    "create_magic_link",
+    "validate_magic_link",
+    "validate_email",
+]