fix(vpn,reconcile): restore WG peers on boot + filebrowser spec drift

Follow-up to 8b7cb002 (no version bump — same v1.7.0-alpha manifest):

* WireGuard peer persistence. Kernel peer state is ephemeral; the add-peer
  RPC wrote each peer to data_dir/nostr-vpn/peers/*.json but nothing
  re-pushed them on reboot. Result on .198: wg0 came up listening with zero
  peers after last night's reboot. Added vpn::restore_wg_peers() — reads
  the peers dir, waits up to 30s for wg0 to exist, then replays each via
  `archipelago-wg add-peer`. Spawned from main.rs alongside the other
  startup tasks.
* Reconcile + filebrowser drift. scripts/container-specs.sh load_spec_
  filebrowser now declares SPEC_NETWORK="archy-net" (to match what
  first-boot-containers.sh creates) and pins the filebrowser-data volume
  + wget-style healthcheck so the reconciler stops reporting network
  drift. Without this, reconcile would kill the healthy first-boot
  filebrowser container and recreate it on bridge, breaking the archy-net
  DNS name the backend proxies to.

Manifest binary sha/size refreshed:
  6c178a76…3582cc, 40361912 bytes.
Rebuilt ISO at image-recipe/results/archipelago-installer-unbundled-x86_64.iso
(Apr 20 07:10) carries both fixes baked in.

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

core/archipelago/src/main.rs

@@ -176,6 +176,14 @@ async fn main() -> Result<()> {
     // Spawn disk space monitor (warns at 85%, auto-cleans at 90%)
     disk_monitor::spawn_disk_monitor(config.data_dir.clone());
 
+    // Restore WireGuard peers into wg0 (kernel loses them on every reboot).
+    {
+        let data_dir = config.data_dir.clone();
+        tokio::spawn(async move {
+            vpn::restore_wg_peers(&data_dir).await;
+        });
+    }
+
     // Spawn ElectrumX status cache (refreshes every 15s, serves cached data to avoid race conditions)
     electrs_status::spawn_status_cache();