Migrate all apps to defpage declarative page routes

Replace Python GET page handlers with declarative defpage definitions in .sx
files across all 8 apps (sx docs, orders, account, market, cart, federation,
events, blog). Each app now has sxc/pages/ with setup functions, layout
registrations, page helpers, and .sx defpage declarations.

Core infrastructure: add g I/O primitive, PageDef support for auth/layout/
data/content/filter/aside/menu slots, post_author auth level, and custom
layout registration. Remove ~1400 lines of render_*_page/render_*_oob
boilerplate. Update all endpoint references in routes, sx_components, and
templates to defpage_* naming.

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

federation/templates/_types/social/header/_header.html

@@ -4,32 +4,32 @@
     <div class="w-full flex flex-row items-center gap-2 flex-wrap">
       {% if actor %}
         <nav class="flex gap-3 text-sm items-center flex-wrap">
-          <a href="{{ url_for('social.home_timeline') }}"
-             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.home_timeline') %}font-bold{% endif %}">
+          <a href="{{ url_for('social.defpage_home_timeline') }}"
+             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.defpage_home_timeline') %}font-bold{% endif %}">
             Timeline
           </a>
-          <a href="{{ url_for('social.public_timeline') }}"
-             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.public_timeline') %}font-bold{% endif %}">
+          <a href="{{ url_for('social.defpage_public_timeline') }}"
+             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.defpage_public_timeline') %}font-bold{% endif %}">
             Public
           </a>
-          <a href="{{ url_for('social.compose_form') }}"
-             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.compose_form') %}font-bold{% endif %}">
+          <a href="{{ url_for('social.defpage_compose_form') }}"
+             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.defpage_compose_form') %}font-bold{% endif %}">
             Compose
           </a>
-          <a href="{{ url_for('social.following_list') }}"
-             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.following_list') %}font-bold{% endif %}">
+          <a href="{{ url_for('social.defpage_following_list') }}"
+             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.defpage_following_list') %}font-bold{% endif %}">
             Following
           </a>
-          <a href="{{ url_for('social.followers_list') }}"
-             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.followers_list') %}font-bold{% endif %}">
+          <a href="{{ url_for('social.defpage_followers_list') }}"
+             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.defpage_followers_list') %}font-bold{% endif %}">
             Followers
           </a>
-          <a href="{{ url_for('social.search') }}"
-             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.search') %}font-bold{% endif %}">
+          <a href="{{ url_for('social.defpage_search') }}"
+             class="px-2 py-1 rounded hover:bg-stone-200 {% if request.path == url_for('social.defpage_search') %}font-bold{% endif %}">
             Search
           </a>
-          <a href="{{ url_for('social.notifications') }}"
-             class="px-2 py-1 rounded hover:bg-stone-200 relative {% if request.path == url_for('social.notifications') %}font-bold{% endif %}">
+          <a href="{{ url_for('social.defpage_notifications') }}"
+             class="px-2 py-1 rounded hover:bg-stone-200 relative {% if request.path == url_for('social.defpage_notifications') %}font-bold{% endif %}">
             Notifications
             <span sx-get="{{ url_for('social.notification_count') }}" sx-trigger="load, every 30s" sx-swap="innerHTML"
                   class="absolute -top-2 -right-3 text-xs bg-red-500 text-white rounded-full px-1 empty:hidden"></span>

federation/templates/federation/_actor_list_items.html

@@ -11,7 +11,7 @@
 
     <div class="flex-1 min-w-0">
       {% if list_type == "following" and a.id %}
-        <a href="{{ url_for('social.actor_timeline', id=a.id) }}" class="font-semibold text-stone-900 hover:underline">
+        <a href="{{ url_for('social.defpage_actor_timeline', id=a.id) }}" class="font-semibold text-stone-900 hover:underline">
           {{ a.display_name or a.preferred_username }}
         </a>
       {% else %}

federation/templates/federation/_interaction_buttons.html

@@ -55,7 +55,7 @@
   {% endif %}
 
   {% if oid %}
-    <a href="{{ url_for('social.compose_form', reply_to=oid) }}"
+    <a href="{{ url_for('social.defpage_compose_form', reply_to=oid) }}"
        class="hover:text-stone-700">Reply</a>
   {% endif %}
 </div>

federation/templates/federation/_search_results.html

@@ -11,7 +11,7 @@
 
     <div class="flex-1 min-w-0">
       {% if a.id %}
-        <a href="{{ url_for('social.actor_timeline', id=a.id) }}" class="font-semibold text-stone-900 hover:underline">
+        <a href="{{ url_for('social.defpage_actor_timeline', id=a.id) }}" class="font-semibold text-stone-900 hover:underline">
           {{ a.display_name or a.preferred_username }}
         </a>
       {% else %}

federation/templates/federation/search.html

@@ -5,10 +5,10 @@
 {% block social_content %}
 <h1 class="text-2xl font-bold mb-6">Search</h1>
 
-<form method="get" action="{{ url_for('social.search') }}" class="mb-6"
-      sx-get="{{ url_for('social.search_page') }}"
+<form method="get" action="{{ url_for('social.defpage_search') }}" class="mb-6"
+      sx-get="{{ url_for('social.defpage_search_page') }}"
       sx-target="#search-results"
-      sx-push-url="{{ url_for('social.search') }}">
+      sx-push-url="{{ url_for('social.defpage_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"

federation/templates/federation/timeline.html

@@ -6,7 +6,7 @@
 <div class="flex items-center justify-between mb-6">
   <h1 class="text-2xl font-bold">{{ "Home" if timeline_type == "home" else "Public" }} Timeline</h1>
   {% if actor %}
-    <a href="{{ url_for('social.compose_form') }}"
+    <a href="{{ url_for('social.defpage_compose_form') }}"
        class="bg-stone-800 text-white px-4 py-2 rounded hover:bg-stone-700">
       Compose
     </a>