fix(api): kill currentPortId persist race + dedupe admin/ports stampede

The dashboard and residential interest smoke tests were intermittently
failing with the page rendering empty/skeleton state. Root causes:

1. ui-store persisted currentPortId/Slug, but those are URL-derived state.
   After login lands on /<first-port-by-name>/dashboard, localStorage holds
   that port. Hard-navigating to /port-nimara/... rehydrated the store with
   the stale id, and useQuery fired with the wrong port before
   PortProvider's URL-sync useEffect could correct it. Drop both fields
   from partialize — PortProvider re-derives them from the route every
   navigation.

2. apiFetch's slug-to-port fallback fired N parallel /api/v1/admin/ports
   calls when N components mounted simultaneously with an empty store.
   Dedupe in-flight lookups so a stampede collapses into one round-trip.

Also tightened four flaky smoke tests that depended on a fixed 3s wait or
non-waiting isVisible({timeout}) — replaced with expect(...).toBeVisible
or expect.poll so they handle dev-mode JIT cold-start delays cleanly.

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

tests/e2e/smoke/19-system-monitoring.spec.ts

@@ -27,7 +27,12 @@ test.describe('System Monitoring', () => {
   test('all BullMQ queues listed with stats', async ({ page }) => {
     await login(page, 'super_admin');
     await navigateTo(page, '/admin/monitoring');
-    await page.waitForTimeout(3_000);
+
+    // Anchor on a queue-only name (not in sidebar) to confirm the panel
+    // has finished loading before counting matches.
+    await expect(page.getByText('webhooks', { exact: false }).first()).toBeVisible({
+      timeout: 15_000,
+    });
 
     // Expected queue names from QUEUE_CONFIGS
     const queueNames = [
@@ -46,7 +51,7 @@ test.describe('System Monitoring', () => {
     let foundCount = 0;
     for (const name of queueNames) {
       const queueCard = page.getByText(name, { exact: false }).first();
-      if (await queueCard.isVisible({ timeout: 2_000 }).catch(() => false)) {
+      if (await queueCard.isVisible().catch(() => false)) {
         foundCount++;
       }
     }