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>

templates/auth/check_email.html

@@ -0,0 +1,18 @@
+{% extends "federation/base.html" %}
+{% block title %}Check your email — Rose Ash{% endblock %}
+{% block content %}
+<div class="py-8 max-w-md mx-auto text-center">
+  <h1 class="text-2xl font-bold mb-4">Check your email</h1>
+  <p class="text-stone-600 mb-2">
+    We sent a sign-in link to <strong>{{ email }}</strong>.
+  </p>
+  <p class="text-stone-500 text-sm">
+    Click the link in the email to sign in. The link expires in 15 minutes.
+  </p>
+  {% if email_error %}
+    <div class="bg-yellow-50 border border-yellow-200 text-yellow-700 p-3 rounded mt-4">
+      {{ email_error }}
+    </div>
+  {% endif %}
+</div>
+{% endblock %}

templates/auth/login.html

@@ -0,0 +1,34 @@
+{% extends "federation/base.html" %}
+{% block title %}Login — Rose Ash{% endblock %}
+{% block content %}
+<div class="py-8 max-w-md mx-auto">
+  <h1 class="text-2xl font-bold mb-6">Sign in</h1>
+
+  {% if error %}
+    <div class="bg-red-50 border border-red-200 text-red-700 p-3 rounded mb-4">
+      {{ error }}
+    </div>
+  {% endif %}
+
+  <form method="post" action="{{ url_for('auth.start_login') }}" class="space-y-4">
+    <div>
+      <label for="email" class="block text-sm font-medium mb-1">Email address</label>
+      <input
+        type="email"
+        name="email"
+        id="email"
+        value="{{ email | default('') }}"
+        required
+        autofocus
+        class="w-full border border-stone-300 rounded px-3 py-2 focus:outline-none focus:ring-2 focus:ring-stone-500"
+      >
+    </div>
+    <button
+      type="submit"
+      class="w-full bg-stone-800 text-white py-2 px-4 rounded hover:bg-stone-700 transition"
+    >
+      Send magic link
+    </button>
+  </form>
+</div>
+{% endblock %}