perf(pipeline): parallel prefetch and lean revision GET

GetRevisionSummary без preview_fragments; boundedRepoCtx для GetRevision;
parallel CDN prefetch с ctx из ingest.

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

internal/ingest/run.go

@@ -3,11 +3,11 @@ package ingest
 import (
 	"context"
 	"log"
-	"net/http"
 	"time"
 
 	"evobgp/internal/broker"
 	"evobgp/internal/config"
+	"evobgp/internal/httpclient"
 	"evobgp/internal/pipeline"
 	"evobgp/internal/store"
 )
@@ -24,7 +24,7 @@ func Run(ctx context.Context, deps *Deps) {
 	if deps == nil || deps.Store == nil {
 		log.Fatalf("evobgp-ingest: missing store (pass ingest.Deps from BootstrapWorkers or evobgp-all)")
 	}
-	hc := &http.Client{Timeout: 45 * time.Second}
+	hc := httpclient.New(httpclient.DefaultTimeout)
 	t := time.NewTicker(60 * time.Second)
 	defer t.Stop()
 	log.Printf("evobgp-ingest: active (CDN conditional GET / ETag prefetch)")
@@ -34,7 +34,10 @@ func Run(ctx context.Context, deps *Deps) {
 			log.Printf("evobgp-ingest: stopped")
 			return
 		case <-t.C:
-			if err := pipeline.PrefetchCDNSourceETags(context.Background(), deps.Store, hc); err != nil {
+			prefetchCtx, cancel := context.WithTimeout(ctx, 50*time.Second)
+			err := pipeline.PrefetchCDNSourceETags(prefetchCtx, deps.Store, hc)
+			cancel()
+			if err != nil {
 				log.Printf("evobgp-ingest: prefetch: %v", err)
 			}
 		}