feat(companion): embedded FIPS mesh replaces WireGuard for remote access

- Android/rust/archy-fips-core: leaf-only fips node as a JNI cdylib (fips
  pinned to the fips-native fork rev with VpnService fd support), built by
  gradle via cargo-ndk (arm64), tested on host
- ArchyVpnService: split-tunnel VpnService routing only fd00::/8 (MTU 1280,
  foreground specialUse); FipsManager handles the one-time VPN consent and
  silent auto-start — no settings surface at all
- pairing QR now fully configures the mesh: fnpub/fip/fhost/fudp/ftcp plus
  fanchors (the node's seed-anchor list, npub@addr/transport) so the phone
  can rendezvous through public anchors when the LAN endpoint is unreachable
- default seed anchors gain the two dual-transport join.fips.network test
  anchors (23.182.128.74:443/tcp, 217.77.8.91:443/tcp); anchor adverts are
  Nostr kind-37195 events
- device token rides the password field end-to-end: backend accepts tokens
  wherever it accepts the password, so scan = instant login (WebSocket auth
  + WebView form injection unchanged); token logins skip TOTP
- ServerEntry.meshIp + IPv6-bracketed URLs; WebView retries the mesh address
  on main-frame errors, auto-login and origin checks honor it
- companion v0.5.0 (versionCode 20), arm64 abiFilter; FipsNative.available
  gates everything so non-arm64 still runs as a plain companion

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

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

@@ -49,6 +49,15 @@ impl RpcHandler {
 
         let valid = self.auth_manager.verify_password(password).await?;
         if !valid {
+            // The companion app sends its device token through the password
+            // field (it reuses the whole password auto-login path, including
+            // the WebView form). Accept a valid token here so that path works.
+            if let Some(device) =
+                crate::device_tokens::verify(&self.config.data_dir, password).await
+            {
+                tracing::info!("[onboarding] device-token login via password field ({device})");
+                return Ok(serde_json::Value::Null);
+            }
             tracing::warn!("[onboarding] login failed — wrong password");
             return Err(anyhow::anyhow!("Password Incorrect"));
         }