Add system/hardware info to the Synology page

Beyond volume/disk health, DSM exposes hostname, CPU, RAM, IP
addresses, model/serial/firmware, and uptime -- surface those too as a
"System" card on the Synology page.

New adapter.getSystemInfo() combines three DSM Web API calls (fields
confirmed against the actively-maintained mib1185/py-synologydsm-api
client, which documents the same SYNO.Core.System / SYNO.Core.System.
Utilization / SYNO.DSM.Network endpoints this adapter already uses the
discover-then-call pattern for):
- SYNO.Core.System "info" -- model, serial, firmware_ver, cpu_cores,
  cpu_clock_speed, up_time (a raw uptime-command-style string, not a
  duration -- parsed client-side into "5d 15h 2m" with a fallback to
  the raw string if DSM ever returns an unexpected format).
- SYNO.Core.System.Utilization "get" -- live CPU load % (user+system+
  other) and real memory usage, in KB.
- SYNO.DSM.Network "list" -- hostname and interface IP addresses
  (loopback filtered out).

New GET /:id/synology/system route alongside the existing /storage
one, read-only like the rest of this integration.

Verified end-to-end against a local mock DSM server standing in for
the real API (login/session flow, all three endpoint shapes, IP
filtering, byte math) since this sandbox can't reach the user's LAN;
also unit-checked the client-side uptime regex against DSM's three
uptime-command formats (with/without days, minutes-only) plus its
unmatched-format fallback.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

server/src/routes/integrations.ts

@@ -704,3 +704,15 @@ integrationsRouter.get("/:id/synology/storage", asyncHandler(async (req, res) =>
     res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
   }
 }));
+
+integrationsRouter.get("/:id/synology/system", asyncHandler(async (req, res) => {
+  const found = await requireSynologyAdapter(req, res);
+  if (!found) return;
+
+  try {
+    const info = await found.adapter.getSystemInfo();
+    res.json(info);
+  } catch (err) {
+    res.status(502).json({ error: err instanceof Error ? err.message : String(err) });
+  }
+}));