Fix field name mismatches, add events filter, in-place suppression refresh

- links.html: fix all field name bugs (auto_negotiation→autoneg, full_duplex,
  tx/rx_errors/drops_per_sec→_rate, tx/rx_bytes_per_sec→_rate, poe_total_w/poe_max_w
  computed from ports, renderUnifiSwitches uses top-level updated timestamp)
- suppressions.html: in-place DOM refresh after create/remove (no page reload),
  datalist autocomplete for target names, form reset after submit
- inspector.html: ESC key closes detail panel via lt.keys.on
- index.html: events filter bar with search input + severity pills (All/Critical/Warning),
  MutationObserver re-applies filter after dynamic updates
- style.css: g-section-actions, events-filter-bar, sev-pills layout
- app.js/db.py/monitor.py: carry forward prior session fixes (Promise.allSettled,
  daemon_ok, stale connection handling, double Prometheus call, self.cfg fix)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/inspector.html

@@ -464,6 +464,9 @@ async function loadInspector() {
 
 loadInspector();
 lt.autoRefresh.start(loadInspector, 60000);
+lt.keys.on('Escape', () => {
+  if (document.getElementById('inspector-panel').classList.contains('open')) closePanel();
+});
 
 // ── Link Diagnostics ─────────────────────────────────────────────────
 let _diagPollTimer = null;