fix: clean up runtime UI and harden session expiry handling

Remove redundant "X/X LIVE" badge from runtime page, breadcrumb trail
and routes section from agent detail page (pills moved into Process
Information card). Fix session expiry: guard against concurrent 401
refresh races and skip re-entrant triggers on auth endpoints.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/AgentHealth/AgentHealth.tsx

@@ -400,14 +400,6 @@ export default function AgentHealth() {
         />
       </div>
 
-      <div style={{ marginBottom: 12 }}>
-        <Badge
-          label={`${liveCount}/${totalInstances} live`}
-          color={deadCount > 0 ? 'error' : staleCount > 0 ? 'warning' : 'success'}
-          variant="filled"
-        />
-      </div>
-
       {/* Application config bar */}
       {appId && appConfig && (
         <div className={`${sectionStyles.section} ${styles.configBar}`}>