Add standalone mode for sx-web.org deployment

- SX_STANDALONE=true env var: no OAuth, no root header, no cross-service
  fragments. Same image runs in both rose-ash cooperative and standalone.
- Factory: added no_oauth parameter to create_base_app()
- Standalone layout defcomps skip ~root-header-auto/~root-mobile-auto
- Fixed Dockerfile: was missing sx/sx/ component directory copy
- CI: deploys sx-web swarm stack on main branch when sx changes
- Stack config at ~/sx-web/ (Caddy → sx_docs, Redis)

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

sx/sx/layouts.sx

@@ -93,3 +93,45 @@
       :label "sx" :href "/" :level 1 :colour "violet"
       :items (~sx-main-nav :section section))
     (~root-mobile-auto)))
+
+;; ---------------------------------------------------------------------------
+;; Standalone layouts (no root header, no auth — for sx-web.org)
+;; ---------------------------------------------------------------------------
+
+(defcomp ~sx-standalone-layout-full (&key section)
+  (~sx-header-row :nav (~sx-main-nav :section section)))
+
+(defcomp ~sx-standalone-layout-oob (&key section)
+  (<> (~sx-header-row
+        :nav (~sx-main-nav :section section)
+        :oob true)
+    (~clear-oob-div :id "sx-header-child")))
+
+(defcomp ~sx-standalone-layout-mobile (&key section)
+  (~mobile-menu-section
+    :label "sx" :href "/" :level 1 :colour "violet"
+    :items (~sx-main-nav :section section)))
+
+(defcomp ~sx-standalone-section-layout-full (&key section sub-label sub-href sub-nav selected)
+  (~sx-header-row
+    :nav (~sx-main-nav :section section)
+    :child (~sx-sub-row :sub-label sub-label :sub-href sub-href
+                        :sub-nav sub-nav :selected selected)))
+
+(defcomp ~sx-standalone-section-layout-oob (&key section sub-label sub-href sub-nav selected)
+  (<> (~oob-header-sx :parent-id "sx-header-child"
+        :row (~sx-sub-row :sub-label sub-label :sub-href sub-href
+                          :sub-nav sub-nav :selected selected))
+    (~sx-header-row
+      :nav (~sx-main-nav :section section)
+      :oob true)))
+
+(defcomp ~sx-standalone-section-layout-mobile (&key section sub-label sub-href sub-nav)
+  (<>
+    (when sub-nav
+      (~mobile-menu-section
+        :label (or sub-label section) :href sub-href :level 2 :colour "violet"
+        :items sub-nav))
+    (~mobile-menu-section
+      :label "sx" :href "/" :level 1 :colour "violet"
+      :items (~sx-main-nav :section section))))