refactor(node): JSON-only control API, Node page absorbs the admin dashboard

Remove the node daemon's server-rendered admin UI (GET / and /audit, the
_render_* helpers and inline templates) and the `meshbay-node ui` CLI verb.
The loopback control API stays; it is now JSON only, ruff-clean, and 453
lines (was 1074). Also drop three never-wired endpoints (/api/config,
/api/chat/history, /ws/chat, plus broadcast_chat) and the pointless
18000/tcp firewall profiles.

The desktop client's Node page (static/node-page.js) takes over what the
dashboard showed, reorganised into six tabs (Overview, Groups, Roster,
Peers, Audit, Settings):
- Overview: version, node id, QUIC port, hub, index-cache maintenance
- Roster: node-wide view with unpin
- Peers and Audit: auto-load on open, no Load button
- Audit: real usernames and group names (resolved from the roster and
  node.toml), Previous/Next pagination newest-first, Export CSV of every
  matching row
- Settings: node settings, STUN, ICE, denylist, then Unlink from hub

Backend: audit.get_entries gains `offset`; /api/audit and /api/peers
resolve ids to names via a new _display_names helper; CSP tightened to
default-src 'none' now that no HTML is served. draft-v6 sections 2.11 and
2.12 corrected -- the Node page uses the loopback API, not MNP.

One capability is intentionally dropped: browser-based admin on a headless
server. The CLI covers every operation there.

See docs/refactor-node-ui.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MQCaZnde4Bjjdu84dhSuF5

1 files changed, 4 insertions, 7 deletions

diff --git a/packaging/build/build-node.sh b/packaging/build/build-node.sh
index d8a5af4..9ad4968 100755
--- a/packaging/build/build-node.sh
+++ b/packaging/build/build-node.sh
@@ -75,13 +75,10 @@ cp "$REPO/packaging/systemd/meshbay-node.service" \
 cp "$REPO/packaging/systemd/meshbay-node-user.service" \
    "$ROOT/usr/lib/systemd/user/meshbay-node.service"
 
-# --- Firewall profiles ----------------------------------------------------
-# firewalld (Fedora)
-mkdir -p "$ROOT/usr/lib/firewalld/services"
-cp "$REPO/packaging/firewall/firewalld/meshbay-node.xml" \
-   "$ROOT/usr/lib/firewalld/services/"
-
-# UFW (Ubuntu/Debian)
+# --- Firewall profile ---------------------------------------------------------
+# UFW (Ubuntu/Debian) — carries the "MeshBay Cast" LAN-casting profile only.
+# The node's own admin surface is a loopback API (127.0.0.1, token-gated) and
+# is never firewall-exposed, so it ships no profile.
 mkdir -p "$ROOT/etc/ufw/applications.d"
 cp "$REPO/packaging/firewall/ufw/meshbay" \
    "$ROOT/etc/ufw/applications.d/"