Feature: Disk-ID Namen + SMART-Daten on demand im VdevTree

- Backend: get_disk_id_map() liest /dev/disk/by-id/ dynamisch aus (ata/nvme/scsi/wwn)
- Backend: _annotate_disk_ids() hängt disk_id an Leaf-Vdevs in get_pool_status()
- Backend: get_smart_info() liest smartctl --json (Modell, Temp, Health, Stunden, Sektoren)
- Backend: GET /api/pools/disks/{disk}/smart Endpoint
- Frontend: DiskRow zeigt Modellname neben sda/sdb, aufklappbar für SMART-Details
- Frontend: Temp-Spalte farbcodiert (grün/gelb/rot), SMART-Spalte zeigt PASSED/FAILED

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

frontend/lib/api.ts

@@ -253,6 +253,21 @@ export class ZFSManagerAPI {
     return response.data
   }
 
+  async getDiskSmart(disk: string): Promise<{
+    model?: string
+    serial?: string
+    protocol?: string
+    power_on_hours?: number
+    temperature?: number
+    passed?: boolean
+    reallocated_sectors?: number
+    pending_sectors?: number
+    uncorrectable?: number
+  }> {
+    const response = await this.client.get(`/api/pools/disks/${disk}/smart`)
+    return response.data
+  }
+
   // Datasets
   async getDatasets(pool: string = "tank"): Promise<Dataset[]> {
     const response = await this.client.get("/api/datasets/", { params: { pool } })