fix: RC hardware-test feedback — mesh serial access, federation.list, masked install errors

- image: create archipelago user with dialout so the backend can open
  /dev/ttyUSB*/ttyACM* LoRa radios; doctor Fix 14 heals existing nodes
  (verified live on the .65 RC install — device detected after the fix)
- Web5Federation.vue called nonexistent federation.list (Unknown method);
  now uses federation.list-nodes + federation.list-pending-requests with
  a last-seen-based online count
- sanitizer: let app-install dependency errors through — 'LND requires a
  running Bitcoin node' was masked as 'Check server logs', so install
  failures on fresh nodes looked random

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

image-recipe/_archived/build-auto-installer-iso.sh

@@ -398,7 +398,7 @@ RUN apt-get update && apt-get -y full-upgrade && apt-get install -y --no-install
 RUN echo "en_US.UTF-8 UTF-8" > /etc/locale.gen && locale-gen
 
 # Create archipelago user with password "archipelago"
-RUN useradd -m -s /bin/bash -G sudo archipelago && \
+RUN useradd -m -s /bin/bash -G sudo,dialout archipelago && \
     echo "archipelago:archipelago" | chpasswd && \
     echo "root:archipelago" | chpasswd && \
     echo "archipelago ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/archipelago