feat(ntp): Live peer status tab (chronyc sources)

Adds GET /ntp/sources endpoint (runs chronyc sources, parses tabular
output) and a new "Peer status" tab in the NTP page showing all
configured peers with mode, state badge, stratum, poll interval,
reach register, last-rx and offset/error sample.

v1.1.101

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

management-ui/src/i18n/locales/en/common.json

@@ -808,7 +808,24 @@
   "ntp": {
     "title": "Time server (Chrony)",
     "intro": "Chrony as time-sync daemon (NTP). Sources on top, listen/serve config on the settings tab. With 'serve_clients' on and LAN-IPs bound, the box itself becomes an NTP server for the LAN.",
-    "tabs": { "pools": "Sources", "settings": "Settings" },
+    "tabs": { "pools": "Sources", "settings": "Settings", "peers": "Peer status" },
+    "sourcesCard": {
+      "title": "Live peer status (chronyc sources)",
+      "name": "Name / IP",
+      "stratum": "Stratum",
+      "poll": "Poll",
+      "reach": "Reach",
+      "lastRx": "Last rx",
+      "sample": "Offset ± error",
+      "reachHint": "8-bit shift register (octal) — 377 = all 8 recent polls replied. 0 = unreachable.",
+      "empty": "No peer data — is chrony running?",
+      "state_synced": "Synced",
+      "state_combined": "Combined",
+      "state_not_combined": "Not combined",
+      "state_unreachable": "Unreachable",
+      "state_error": "Error",
+      "state_variable": "Variable"
+    },
     "statusCard": {
       "title": "Sync status (chronyc tracking)",
       "sync": "Synchronized",