release(v1.7.21-alpha): operator-editable FIPS seed anchors

Adds a local seed-anchor list at <data_dir>/seed-anchors.json. Each
entry is {npub, address, transport, label}. On archipelago startup
and every 5 minutes the list is pushed into the running fips daemon
via `fipsctl connect <npub> <addr> <transport>`, so a cluster can
anchor itself independently of the global fips.v0l.io. A flaky or
unreachable public anchor no longer strands a fresh install.

New RPCs:
- fips.list-seed-anchors
- fips.add-seed-anchor (validates npub1… + host:port)
- fips.remove-seed-anchor
- fips.apply-seed-anchors (on-demand re-dial)

New standalone UI card at views/server/FipsSeedAnchorsCard.vue. Not
wired into Home.vue / Server.vue — operator places it per the
entry-point convention.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

core/archipelago/src/server.rs

@@ -353,6 +353,34 @@ impl Server {
             });
         }
 
+        // FIPS seed-anchor apply loop — every 5 minutes we re-push the
+        // configured seed anchors into the running fips daemon via
+        // `fipsctl connect`. This keeps the mesh bootstrap resilient:
+        // operators add cluster-local anchors in the UI, and a daemon
+        // restart or a flaky public anchor can't strand the node.
+        // First run is delayed 30s so fips has time to come up after
+        // onboarding before we start dialing.
+        {
+            let data_dir = config.data_dir.clone();
+            tokio::spawn(async move {
+                tokio::time::sleep(Duration::from_secs(30)).await;
+                let mut interval = tokio::time::interval(Duration::from_secs(300));
+                loop {
+                    interval.tick().await;
+                    match crate::fips::anchors::load(&data_dir).await {
+                        Ok(list) if !list.is_empty() => {
+                            let _ = crate::fips::anchors::apply(&list).await;
+                        }
+                        Ok(_) => { /* no seed anchors configured yet */ }
+                        Err(e) => tracing::debug!(
+                            "Seed-anchor apply: load failed (non-fatal): {}",
+                            e
+                        ),
+                    }
+                }
+            });
+        }
+
         // did:dht auto-refresh — re-publish DHT records every 2 hours
         if config.nostr_discovery_enabled {
             let data_dir = config.data_dir.clone();