fix(aiui): bundle demo/aiui in self-update and ISO builds so updates never wipe it

Every OTA self-update and every ISO capture was implicitly relying on
/opt/archipelago/web-ui/aiui/ already being present on disk. Any node that
had its web-ui directory atomically swapped (for example by a manual
deployment shipping only neode-ui dist output) lost aiui entirely and the
AI Assistant tab fell through to the "needs to be enabled" placeholder.

self-update.sh: drop the rsync --exclude aiui preservation trick and
instead stage demo/aiui into the freshly-built dist tree before rsync.
demo/aiui in the repo is now the source of truth; every update overwrites
the on-disk copy with a matching version rather than carrying forward
whatever stale bundle happened to survive.

build-auto-installer-iso.sh: prepend demo/aiui to the AIUI search list so
ISO builds from a fresh repo clone pick it up automatically, without
requiring a side-checkout of the AIUI project or a live dev server.

This matches create-release-manifest.sh which already bakes demo/aiui
into the release tarball (lines 86-89).

scripts/self-update.sh

@@ -157,12 +157,23 @@ else
     exit 1
 fi
 
-# Install frontend (preserve aiui and claude-login.html)
+# Install frontend (always ship fresh AIUI from demo/aiui; preserve claude-login.html)
 BUILT_WEB="$REPO_DIR/web/dist/neode-ui"
 if [ -d "$BUILT_WEB" ]; then
-    # Sync new files, preserving aiui/ and claude-login.html
+    # Bake AIUI into the built tree so rsync --delete does not wipe it.
+    # demo/aiui is the canonical AIUI bundle checked into the repo; copying
+    # it here means every self-update ships a matching AIUI version instead
+    # of preserving whatever stale copy happened to be on disk (which is
+    # empty on nodes where an earlier ad-hoc deploy blew it away).
+    if [ -d "$REPO_DIR/demo/aiui" ] && [ -f "$REPO_DIR/demo/aiui/index.html" ]; then
+        log "Staging AIUI bundle from demo/aiui into frontend dist..."
+        rm -rf "$BUILT_WEB/aiui"
+        cp -r "$REPO_DIR/demo/aiui" "$BUILT_WEB/aiui"
+    else
+        warn "demo/aiui not found in repo; existing /opt/archipelago/web-ui/aiui will be wiped by rsync --delete"
+    fi
+    # Sync new files, preserving claude-login.html (per-node admin bookmark)
     sudo rsync -a --delete \
-        --exclude 'aiui' \
         --exclude 'claude-login.html' \
         "$BUILT_WEB/" "$INSTALL_WEB/"
     ok "Frontend installed"