feat(httpclient): add circuit breaker for CDN and RIPEstat

Per-host circuit breaker с retry для CDN fetch и RIPEstat; порог 5 ошибок,
cooldown 30s.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/asnresolve/ripestat.go

@@ -40,7 +40,7 @@ func AnnouncedPrefixes(ctx context.Context, hc *http.Client, asn int64) ([]netip
 	req.Header.Set("Accept", "application/json")
 	req.Header.Set("User-Agent", "evobgp-asnresolve/1.0")
 
-	resp, err := hc.Do(req)
+	resp, err := httpclient.DoWithBreaker(ctx, hc, req, 3)
 	if err != nil {
 		return nil, fmt.Errorf("ripestat fetch AS%d: %w", asn, err)
 	}
@@ -102,7 +102,7 @@ func ASHolderName(ctx context.Context, hc *http.Client, asn int64) (string, erro
 	req.Header.Set("Accept", "application/json")
 	req.Header.Set("User-Agent", "evobgp-asnresolve/1.0")
 
-	resp, err := hc.Do(req)
+	resp, err := httpclient.DoWithBreaker(ctx, hc, req, 3)
 	if err != nil {
 		return "", fmt.Errorf("ripestat as-overview AS%d: %w", asn, err)
 	}