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>

core/archipelago/src/api/rpc/middleware.rs

@@ -64,6 +64,13 @@ pub(super) fn sanitize_error_message(msg: &str) -> String {
         "Failed to open channel",
         "Failed to close channel",
         "Failed to connect to peer",
+        // App-install dependency errors (package/dependencies.rs) — masking
+        // these left users retrying installs blind ("LND install failed" on a
+        // fresh node was really "Bitcoin Knots isn't running yet")
+        "LND requires",
+        "ElectrumX requires",
+        "BTCPay Server requires",
+        "Mempool requires",
         "Container",
         "Image",
         "Bitcoin address",