feat: show live tunnel links in the intelligence web UI

Expose the live tunnel list on /healthz and render one clickable chip per
tunnel (provider label linking to the tunnel origin) in the Project
Observatory livebar, refreshed with the existing auto-refresh tick; show
a connecting placeholder while providers are still joining.

Author: francis-du

src/integrations/mcp.rs

@@ -901,6 +901,14 @@ async fn health(State(state): State<Arc<AppState>>) -> Json<Value> {
         "public_url_error": connection.public_url_error,
         "tunnel_running": connection.tunnel_running,
         "tunnel_error": connection.tunnel_error,
+        "tunnels": state
+            .monitor
+            .tunnel_links()
+            .into_iter()
+            .map(|(provider, url)| {
+                json!({"provider": provider, "url": url, "mcp_url": format!("{url}/mcp")})
+            })
+            .collect::<Vec<_>>(),
         "active_tasks": connection.active_tasks,
         "queued_tasks": connection.queued_tasks,
         "peak_active_tasks": connection.peak_active_tasks,

src/ui/intelligence_web/app.css

@@ -29,7 +29,7 @@ <h1 data-i18n="Project Observatory">Project Observatory</h1>
 
   <section class="livebar" aria-live="polite">
     <div class="live-left"><span id="syncDot" class="sync-dot"></span><strong id="syncState" data-i18n="Connecting">Connecting</strong><span id="projectIdentity" class="live-project">—</span></div>
-    <div class="live-right"><span id="precisionBadge" class="precision-badge">—</span><span id="lastUpdated" class="muted">—</span></div>
+    <div class="live-right"><span id="tunnels" class="tunnel-links"></span><span id="precisionBadge" class="precision-badge">—</span><span id="lastUpdated" class="muted">—</span></div>
   </section>
 
   <section id="accessPanel" class="panel access-panel hidden">