Add enclosure health details (PSUs, fans, temps, voltages) via SES

Parse sg_ses --page=0x02 output to surface enclosure-level health data
including power supply status, fan RPMs, temperature sensors, and voltage
rails. Failed/critical components are reflected in the overview totals
and shown as status pills in the enclosure card header with an expandable
detail panel.

routers/overview.py

@@ -5,12 +5,13 @@ from fastapi import APIRouter
 
 from models.schemas import (
     DriveHealthSummary,
+    EnclosureHealth,
     EnclosureWithDrives,
     HostDrive,
     Overview,
     SlotWithDrive,
 )
-from services.enclosure import discover_enclosures, list_slots
+from services.enclosure import discover_enclosures, get_enclosure_status, list_slots
 from services.host import get_host_drives
 from services.smart import get_smart_data
 from services.zfs import get_zfs_pool_map
@@ -26,13 +27,24 @@ async def get_overview():
     enclosures_raw = discover_enclosures()
     pool_map = await get_zfs_pool_map()
 
+    # Fetch SES health data for all enclosures concurrently
+    async def _get_health(enc):
+        if enc.get("sg_device"):
+            return await get_enclosure_status(enc["sg_device"])
+        return None
+
+    health_results = await asyncio.gather(
+        *[_get_health(enc) for enc in enclosures_raw],
+        return_exceptions=True,
+    )
+
     enc_results: list[EnclosureWithDrives] = []
     total_drives = 0
     warnings = 0
     errors = 0
     all_healthy = True
 
-    for enc in enclosures_raw:
+    for enc_idx, enc in enumerate(enclosures_raw):
         slots_raw = list_slots(enc["id"])
 
         # Gather SMART data for all populated slots concurrently
@@ -110,6 +122,20 @@ async def get_overview():
                 drive=drive_summary,
             ))
 
+        # Attach enclosure health from SES
+        health_data = health_results[enc_idx]
+        enc_health = None
+        if isinstance(health_data, dict):
+            enc_health = EnclosureHealth(**health_data)
+            # Count enclosure-level issues
+            if enc_health.overall_status == "CRITICAL":
+                errors += 1
+                all_healthy = False
+            elif enc_health.overall_status == "WARNING":
+                warnings += 1
+        elif isinstance(health_data, Exception):
+            logger.warning("SES health failed for %s: %s", enc["id"], health_data)
+
         enc_results.append(EnclosureWithDrives(
             id=enc["id"],
             sg_device=enc.get("sg_device"),
@@ -119,6 +145,7 @@ async def get_overview():
             total_slots=enc["total_slots"],
             populated_slots=enc["populated_slots"],
             slots=slots_out,
+            health=enc_health,
         ))
 
     # Host drives (non-enclosure)