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/pipeline/collect_parallel.go

@@ -155,7 +155,7 @@ func collectCDNPrefixRows(ctx context.Context, st store.Backend, hc *http.Client
 					return
 				}
 			}
-			rows, err := applyCDNSourceHTTPResult(ctx, st, hc, tenantID, moduleID, mod, src, priorSnapshot, now)
+			rows, err := fetchCDNSourceRows(ctx, st, hc, tenantID, moduleID, mod, src, priorSnapshot, now)
 			if err != nil {
 				results[idx] = srcResult{err: err}
 				return
@@ -172,6 +172,11 @@ func collectCDNPrefixRows(ctx context.Context, st store.Backend, hc *http.Client
 		}
 		out = append(out, r.rows...)
 	}
+	if len(valid) > 0 {
+		if err := mergeAllCDNSourcesIntoModuleSnapshot(st, tenantID, mod, priorSnapshot, out); err != nil {
+			return nil, err
+		}
+	}
 	return out, nil
 }