Add per-app AP social UI for blog, market, and events

Lightweight social pages (search, follow/unfollow, followers, following,
actor timeline) auto-registered for AP-enabled apps via shared blueprint.
Federation keeps the full social hub. Followers scoped per app_domain;
post cards show "View on Hub" link instead of interaction buttons.

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

shared/browser/templates/social/search.html

@@ -0,0 +1,32 @@
+{% extends "_types/social_lite/index.html" %}
+
+{% block title %}Search — Rose Ash{% endblock %}
+
+{% block social_content %}
+<h1 class="text-2xl font-bold mb-6">Search</h1>
+
+<form method="get" action="{{ url_for('ap_social.search') }}" class="mb-6"
+      hx-get="{{ url_for('ap_social.search_page') }}"
+      hx-target="#search-results"
+      hx-push-url="{{ url_for('ap_social.search') }}">
+  <div class="flex gap-2">
+    <input type="text" name="q" value="{{ query }}"
+      class="flex-1 border border-stone-300 rounded-lg px-4 py-2 focus:outline-none focus:ring-2 focus:ring-stone-500"
+      placeholder="Search users or @user@instance.tld">
+    <button type="submit"
+      class="bg-stone-800 text-white px-6 py-2 rounded hover:bg-stone-700">
+      Search
+    </button>
+  </div>
+</form>
+
+{% if query and total %}
+  <p class="text-sm text-stone-500 mb-4">{{ total }} result{{ 's' if total != 1 }} for <strong>{{ query }}</strong></p>
+{% elif query %}
+  <p class="text-stone-500 mb-4">No results found for <strong>{{ query }}</strong></p>
+{% endif %}
+
+<div id="search-results">
+  {% include "social/_search_results.html" %}
+</div>
+{% endblock %}