perf: quick wins for pipeline, jobs, httpapi and web ops

- CDN snapshot: batch merge после parallel fetch, без race на persist
- ListRevisionPrefixes: лёгкая проверка revision вместо GetRevision
- Jobs: timeout/cancel context для pipeline и deploy
- HTTP server timeouts; кэш birdc для GET /peers
- ListModules: batch DoH profiles одним запросом
- Web: tab-scoped load на /operations, debounce job search, меньше over-fetch на dashboard

Co-authored-by: Cursor <[email protected]>

internal/observability/metrics.go

@@ -82,6 +82,12 @@ var (
 	})
 )
 
+var (
+	birdProtocolStatesMu sync.RWMutex
+	birdProtocolStates   map[string]string
+	birdProtocolStatesAt time.Time
+)
+
 // RecordPrefixAggregation records tenant render CIDR aggregation stats.
 func RecordPrefixAggregation(rawCount, aggregatedCount int, duration time.Duration) {
 	if rawCount < 0 {
@@ -205,6 +211,35 @@ func SetBirdSessionMetrics(established int, scrapeOK bool) {
 	}
 }
 
+// SetBirdProtocolStates caches parsed BGP protocol states from the last birdc scrape.
+func SetBirdProtocolStates(states map[string]string) {
+	birdProtocolStatesMu.Lock()
+	defer birdProtocolStatesMu.Unlock()
+	if states == nil {
+		birdProtocolStates = map[string]string{}
+	} else {
+		birdProtocolStates = states
+	}
+	birdProtocolStatesAt = time.Now()
+}
+
+// CachedBirdProtocolStates returns cached protocol states if younger than maxAge.
+func CachedBirdProtocolStates(maxAge time.Duration) (map[string]string, bool) {
+	if maxAge <= 0 {
+		maxAge = 60 * time.Second
+	}
+	birdProtocolStatesMu.RLock()
+	defer birdProtocolStatesMu.RUnlock()
+	if birdProtocolStates == nil || time.Since(birdProtocolStatesAt) > maxAge {
+		return nil, false
+	}
+	out := make(map[string]string, len(birdProtocolStates))
+	for k, v := range birdProtocolStates {
+		out[k] = v
+	}
+	return out, true
+}
+
 // MetricsHandler returns the Prometheus scrape handler.
 func MetricsHandler() http.Handler {
 	return promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{})
@@ -231,7 +266,7 @@ func (s *statusRecorder) WriteHeader(code int) {
 
 // StartBirdProtocolsPoller runs birdc "show protocols" on interval when socket is non-empty.
 // Горутина завершается при отмене ctx (корректное завершение вместе с процессом API).
-func StartBirdProtocolsPoller(ctx context.Context, socket string, birdcPath string, interval time.Duration, showFn func(ctx context.Context, socket, birdcBin string) (string, error), countFn func(output string) int) {
+func StartBirdProtocolsPoller(ctx context.Context, socket string, birdcPath string, interval time.Duration, showFn func(ctx context.Context, socket, birdcBin string) (string, error), countFn func(output string) int, parseFn func(output string) map[string]string) {
 	socket = trimSpace(socket)
 	if ctx == nil || socket == "" || interval <= 0 || showFn == nil || countFn == nil {
 		return
@@ -245,6 +280,9 @@ func StartBirdProtocolsPoller(ctx context.Context, socket string, birdcPath stri
 			return
 		}
 		SetBirdSessionMetrics(countFn(out), true)
+		if parseFn != nil {
+			SetBirdProtocolStates(parseFn(out))
+		}
 	}
 	go func() {
 		scrape()