feat(devops): diagnose slow HK requests and dependency timings

src/messages/uk.json

@@ -3472,6 +3472,29 @@
 				"lastAttempt": "Last attempt: {date}",
 				"queuing": "Queuing…",
 				"queue": "Export now / retry"
+			},
+			"performance": {
+				"title": "Request performance",
+				"scope": "Authenticated HK APIs: server time until the response is ready. This does not measure browser rendering or public pages.",
+				"refresh": "Refresh",
+				"shared": "Shared diagnostics via Redis.",
+				"local": "Local diagnostics for this instance only; cleared on restart.",
+				"retention": "Up to 200 recent requests, retained for one hour. Collection is best effort.",
+				"search": "Route or operation ID",
+				"sort": "Order",
+				"slowest": "Slowest first",
+				"recent": "Most recent first",
+				"threshold": "Duration filter",
+				"all": "All durations",
+				"slow": "At least 1 second",
+				"explanation": "Database time includes completed queries and pool waits. External time covers monitored curl downloads only. Concurrent calls can add up to more than the request duration; these values are not exclusive parts of the total.",
+				"empty": "No matching requests yet. Use the HK, then refresh this page.",
+				"database": "Database",
+				"external": "Monitored downloads",
+				"calls": "{count} calls",
+				"failures": "{count} failures",
+				"streaming": "Streaming response: timing stops at response creation, not at the end of the operation.",
+				"operation": "Operation ID"
 			}
 		},
 		"error": {