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/jobs/context.go

@@ -0,0 +1,77 @@
+package jobs
+
+import (
+	"context"
+	"os"
+	"strconv"
+	"time"
+)
+
+const (
+	defaultJobTimeoutModuleRefresh = 10 * time.Minute
+	defaultJobTimeoutTenantRefresh = 15 * time.Minute
+	defaultJobTimeoutDeployApply   = 5 * time.Minute
+	defaultJobTimeoutPeerReconcile = 10 * time.Minute
+	defaultJobTimeoutRollback      = 5 * time.Minute
+	defaultJobTimeoutBirdReload    = 2 * time.Minute
+)
+
+func jobTimeout(kind string) time.Duration {
+	envKey := map[string]string{
+		KindModuleRefresh:    "EVOBGP_JOB_TIMEOUT_MODULE_REFRESH",
+		KindTenantRefresh:    "EVOBGP_JOB_TIMEOUT_TENANT_REFRESH",
+		KindDeployApply:      "EVOBGP_JOB_TIMEOUT_DEPLOY_APPLY",
+		KindPeerReconcile:    "EVOBGP_JOB_TIMEOUT_PEER_RECONCILE",
+		KindRevisionRollback: "EVOBGP_JOB_TIMEOUT_ROLLBACK",
+		KindBirdReload:       "EVOBGP_JOB_TIMEOUT_BIRD_RELOAD",
+	}[kind]
+	if envKey != "" {
+		if d, err := time.ParseDuration(os.Getenv(envKey)); err == nil && d > 0 {
+			return d
+		}
+	}
+	switch kind {
+	case KindModuleRefresh:
+		return defaultJobTimeoutModuleRefresh
+	case KindTenantRefresh:
+		return defaultJobTimeoutTenantRefresh
+	case KindDeployApply:
+		return defaultJobTimeoutDeployApply
+	case KindPeerReconcile:
+		return defaultJobTimeoutPeerReconcile
+	case KindRevisionRollback:
+		return defaultJobTimeoutRollback
+	case KindBirdReload:
+		return defaultJobTimeoutBirdReload
+	default:
+		if n, err := strconv.Atoi(os.Getenv("EVOBGP_JOB_TIMEOUT_SEC")); err == nil && n > 0 {
+			return time.Duration(n) * time.Second
+		}
+		return defaultJobTimeoutModuleRefresh
+	}
+}
+
+// workContext returns a timeout context that also cancels when the job is cancelled.
+func (j *Job) workContext() (context.Context, context.CancelFunc) {
+	if j == nil {
+		return context.Background(), func() {}
+	}
+	timeout := jobTimeout(j.Kind)
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	go func() {
+		ticker := time.NewTicker(500 * time.Millisecond)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-ticker.C:
+				if j.IsCancelRequested() {
+					cancel()
+					return
+				}
+			}
+		}
+	}()
+	return ctx, cancel
+}