Feature: ZFS Pool-Aktionen (Scrub, Resilver, Clear Errors) + Product-Spalte fix

- Backend: neue Endpoints POST /api/pools/{name}/clear und /resilver
- Frontend: Pool ⋮-Menü mit Scrub, Resilver, Clear Errors
- Product-Spalte im Status-Tab bricht jetzt korrekt um statt abgeschnitten zu werden

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

frontend/lib/api.ts

@@ -223,6 +223,16 @@ export class ZFSManagerAPI {
     return response.data
   }
 
+  async clearPoolErrors(poolName: string): Promise<{ status: string }> {
+    const response = await this.client.post(`/api/pools/${poolName}/clear`)
+    return response.data
+  }
+
+  async resilverPool(poolName: string): Promise<{ status: string }> {
+    const response = await this.client.post(`/api/pools/${poolName}/resilver`)
+    return response.data
+  }
+
   // Datasets
   async getDatasets(pool: string = "tank"): Promise<Dataset[]> {
     const response = await this.client.get("/api/datasets/", { params: { pool } })