Route outbound Follow through EventProcessor for retry

send_follow now emits a Follow activity via emit_activity() instead of
inline HTTP POST. New ap_follow_handler delivers to the remote inbox;
EventProcessor retries on failure. Wildcard delivery handler skips
Follow type to avoid duplicate broadcast.

Also add /social/ index page to per-app social blueprint.

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

shared/browser/templates/social/index.html

@@ -0,0 +1,33 @@
+{% extends "_types/social_lite/index.html" %}
+
+{% block title %}Social — Rose Ash{% endblock %}
+
+{% block social_content %}
+<h1 class="text-2xl font-bold mb-6">Social</h1>
+
+{% if actor %}
+  <div class="space-y-3">
+    <a href="{{ url_for('ap_social.search') }}" class="block bg-white rounded-lg shadow-sm border border-stone-200 p-4 hover:bg-stone-50">
+      <div class="font-semibold">Search</div>
+      <div class="text-sm text-stone-500">Find and follow accounts on the fediverse</div>
+    </a>
+    <a href="{{ url_for('ap_social.following_list') }}" class="block bg-white rounded-lg shadow-sm border border-stone-200 p-4 hover:bg-stone-50">
+      <div class="font-semibold">Following</div>
+      <div class="text-sm text-stone-500">Accounts you follow</div>
+    </a>
+    <a href="{{ url_for('ap_social.followers_list') }}" class="block bg-white rounded-lg shadow-sm border border-stone-200 p-4 hover:bg-stone-50">
+      <div class="font-semibold">Followers</div>
+      <div class="text-sm text-stone-500">Accounts following you here</div>
+    </a>
+    <a href="{{ federation_url('/social/') }}" class="block bg-white rounded-lg shadow-sm border border-stone-200 p-4 hover:bg-stone-50">
+      <div class="font-semibold">Hub</div>
+      <div class="text-sm text-stone-500">Full social experience — timeline, compose, notifications</div>
+    </a>
+  </div>
+{% else %}
+  <p class="text-stone-500">
+    <a href="{{ url_for('ap_social.search') }}" class="underline">Search</a> for accounts on the fediverse, or visit the
+    <a href="{{ federation_url('/social/') }}" class="underline">Hub</a> to get started.
+  </p>
+{% endif %}
+{% endblock %}