feat(cli,tunnel): v3.4 client consumes manifest endpoints + fix #45 silent client exit

Two follow-ups to the previous v3.4 commit (ba8d6b7):

## #49 — client uses BridgeEndpoint ports as authoritative

BridgesDiscoveryWatcher now keeps a second snapshot
(`Arc<RwLock<Vec<BridgeEndpoint>>>`) for the per-transport endpoints carried by
v3.4 manifests, alongside the existing flat-bridges snapshot for v3.3
compatibility. `endpoints_snapshot()` and `primary_endpoint()` expose it to the
client.

In `client::run`, immediately after the watcher loads, the primary endpoint's
per-transport ports override the dial-time `dial_cfg.endpoints.{tcp,quic,udp}`
*ports*. The IP stays whatever the dialer already resolved (server_addr /
bridge list). This is what closes the loop on the user's friend's setup: the
server picks 8444 because sing-box has 443/8443, signs a manifest with
`endpoints = [{tcp: 8444, ...}]`, the client loads it on next refresh and
starts dialing the right port without an operator-side `client.toml` edit.

When the manifest has no `endpoints` field (old v3.3 format, or operator
chose not to publish per-transport ports), no override is applied and the
client.toml `[transport] *_port` values are used as before.

## #45 — silent client exit on broken connection

Root cause confirmed in `AuraRouter::run`:
- the inbound task did `let pkt = inbound_conn.recv_packet().await?;`, so any
  recv error returned silently via `?`
- the `to_tun_tx` channel sender dropped, `to_tun_rx.recv()` returned `None`
- the outbound `select!` arm matched `None => break Ok(())`
- the router returned `Ok(())`, the client's `run()` returned `Ok(())`, the
  process exited 0 with no log, no error message

We saw this empirically when the user disabled a co-resident VPN that had been
routing AuraVPN's UDP/444 traffic — the underlying QUIC socket broke, the
inbound task hit recv error, and the whole client vanished.

Fix:
- Inbound task now logs the error at `error` level with the underlying
  `recv_packet` cause before exiting.
- The outbound `select!`'s `None` arm now returns an Err (not Ok(())) so the
  caller knows the tunnel died and `aura client` exits non-zero — which is
  what a supervisor (systemd, launchd, or a future auto-redial loop) wants to
  see.
- The router waits up to 200ms for the inbound task to land cleanly before
  returning, so its error / panic is logged instead of being swallowed by
  `abort()`.

Existing tests still pass (12/12 in aura-tunnel router tests). Tested
manually: with the fix, killing the underlying transport now produces a
"peer connection broke (recv_packet failed): …" error line and a non-zero
exit, instead of silent process disappearance.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

crates/aura-cli/src/bridges.rs

@@ -333,6 +333,10 @@ impl BridgeManifest {
 pub struct BridgesDiscoveryWatcher {
     /// The current effective merged list (static + manifest, de-duplicated by `SocketAddr`).
     snapshot: Arc<RwLock<Vec<SocketAddr>>>,
+    /// v3.4: the per-transport endpoints carried by the most-recently-loaded manifest. Empty
+    /// when the manifest has no `endpoints` field (v3.3-format manifest, or v3.4 manifest where
+    /// the operator opted not to publish per-transport ports).
+    endpoints_snapshot: Arc<RwLock<Vec<BridgeEndpoint>>>,
     /// The static list from `[client] bridges` (used as a fallback when the manifest is missing).
     static_bridges: Vec<SocketAddr>,
     /// File path of the signed manifest.
@@ -355,8 +359,10 @@ impl BridgesDiscoveryWatcher {
         static_bridges: Vec<SocketAddr>,
     ) -> Self {
         let snapshot = Arc::new(RwLock::new(static_bridges.clone()));
+        let endpoints_snapshot = Arc::new(RwLock::new(Vec::new()));
         let watcher = Self {
             snapshot,
+            endpoints_snapshot,
             static_bridges,
             manifest_path,
             ca_cert_pem,
@@ -366,6 +372,20 @@ impl BridgesDiscoveryWatcher {
         watcher
     }
 
+    /// v3.4: clone of the per-transport endpoint snapshot. Empty when the manifest has no
+    /// `endpoints` field. The dialer's [`Endpoints`](aura_transport::Endpoints) port overrides
+    /// should be derived from this — see [`Self::primary_endpoint`].
+    pub async fn endpoints_snapshot(&self) -> Vec<BridgeEndpoint> {
+        self.endpoints_snapshot.read().await.clone()
+    }
+
+    /// v3.4: first endpoint from the snapshot, when present. Useful for the common case of a
+    /// single-server deployment where the watcher mainly mirrors the primary server's chosen
+    /// ports.
+    pub async fn primary_endpoint(&self) -> Option<BridgeEndpoint> {
+        self.endpoints_snapshot.read().await.first().cloned()
+    }
+
     /// Snapshot handle: clones of this `Arc<RwLock<...>>` can be read concurrently by the dial loop.
     pub fn handle(&self) -> Arc<RwLock<Vec<SocketAddr>>> {
         Arc::clone(&self.snapshot)
@@ -386,11 +406,17 @@ impl BridgesDiscoveryWatcher {
                 let merged = merged_snapshot(&self.static_bridges, &manifest.parsed_bridges());
                 let merged_len = merged.len();
                 *self.snapshot.write().await = merged;
+                // v3.4: copy the per-transport endpoints over too. They drive dial-time port
+                // overrides on the client (see [`crate::client::run`]). Old v3.3 manifests have
+                // an empty `endpoints` field and the snapshot just clears.
+                let endpoints_len = manifest.endpoints.len();
+                *self.endpoints_snapshot.write().await = manifest.endpoints.clone();
                 tracing::info!(
                     path = %self.manifest_path.display(),
                     generated_at = manifest.generated_at,
                     expires_at = manifest.expires_at,
                     manifest_bridges = manifest.bridges.len(),
+                    manifest_endpoints = endpoints_len,
                     merged_total = merged_len,
                     "loaded signed bridges manifest"
                 );

crates/aura-cli/src/client.rs

@@ -131,6 +131,36 @@ pub async fn run(config_path: &Path, admin_socket: &str) -> anyhow::Result<()> {
         // returned JoinHandle. Dropping the watcher returned by `new` would also be fine —
         // the handle keeps a clone of the Arc and outlives the local binding.
         let _bg = watcher.spawn_refresh();
+        // v3.4: when the manifest carries per-transport endpoints, override the dial-time
+        // *_port for each transport with the operator's published value. This is what lets a
+        // server that had to port-scan past a busy 8443 (sing-box / Hysteria2 on the same host)
+        // tell its clients to use 8444 instead — the client.toml's static [transport] ports
+        // become only the bootstrap fallback. We deliberately override only the *port*: the IP
+        // stays whatever the dialer already resolved (server_addr / bridge list), because the
+        // bridges manifest is authoritative for ports but not for which host the client is
+        // currently talking to.
+        if let Some(ep) = watcher.primary_endpoint().await {
+            let mut applied = Vec::new();
+            if let (Some(port), Some(addr)) = (ep.tcp, dial_cfg.endpoints.tcp) {
+                dial_cfg.endpoints.tcp = Some(std::net::SocketAddr::new(addr.ip(), port));
+                applied.push(format!("tcp={}", port));
+            }
+            if let (Some(port), Some(addr)) = (ep.quic, dial_cfg.endpoints.quic) {
+                dial_cfg.endpoints.quic = Some(std::net::SocketAddr::new(addr.ip(), port));
+                applied.push(format!("quic={}", port));
+            }
+            if let (Some(port), Some(addr)) = (ep.udp, dial_cfg.endpoints.udp) {
+                dial_cfg.endpoints.udp = Some(std::net::SocketAddr::new(addr.ip(), port));
+                applied.push(format!("udp={}", port));
+            }
+            if !applied.is_empty() {
+                tracing::info!(
+                    endpoint_host = %ep.host,
+                    overrides = %applied.join(","),
+                    "v3.4 manifest endpoints override dial-time transport ports"
+                );
+            }
+        }
         tracing::info!(
             path = %manifest_path.display(),
             refresh_interval_secs = refresh_secs,