feat(workspace): enhance status cards and terminal groups

add memory and disk monitoring cards with richer server metrics
and localized labels in the workspace status panel

group ssh terminal tabs by server with per-group add actions to
make multi-terminal relationships clearer

sync helloagents archive and module documentation for the
completed workspace updates

packages/frontend/src/locales/en-US.json

@@ -594,6 +594,18 @@
     "megaBytes": "MB",
     "gigaBytes": "GB",
     "swapNotAvailable": "Swap Unavailable",
+    "memoryCardTitle": "Memory",
+    "memoryUsedStat": "Used",
+    "memoryCachedStat": "Cached",
+    "memoryFreeStat": "Free",
+    "diskCardTitle": "Disk",
+    "diskTypeLabel": "Type",
+    "diskReadRateLabel": "Read/s",
+    "diskWriteRateLabel": "Write/s",
+    "diskMountLabel": "Mount",
+    "diskSizeLabel": "Size",
+    "diskAvailableLabel": "Available",
+    "diskUsedPercentLabel": "Used%",
     "cpuUsageTitle": "CPU Usage",
     "memoryUsageTitleUnit": "Memory Usage ({unit})",
     "networkSpeedTitleUnit": "Network Speed ({unit})",