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>

backend/routers/pools.py

@@ -93,6 +93,38 @@ async def scrub_pool(pool_name: str, current_user: str = Depends(get_current_use
         raise HTTPException(status_code=500, detail=str(e))
 
 
+@router.post("/{pool_name}/clear")
+async def clear_pool_errors(pool_name: str, current_user: str = Depends(get_current_user)):
+    """
+    Clear error counters on pool
+    """
+    try:
+        stdout, stderr, rc = zfs_runner.run_command(["zpool", "clear", pool_name])
+        if rc != 0:
+            raise HTTPException(status_code=400, detail=stderr.strip() or "Failed to clear errors")
+        return {"status": "success", "message": f"Errors cleared on {pool_name}"}
+    except HTTPException:
+        raise
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@router.post("/{pool_name}/resilver")
+async def resilver_pool(pool_name: str, current_user: str = Depends(get_current_user)):
+    """
+    Start resilver on pool
+    """
+    try:
+        stdout, stderr, rc = zfs_runner.run_command(["zpool", "resilver", pool_name])
+        if rc != 0:
+            raise HTTPException(status_code=400, detail=stderr.strip() or "Failed to start resilver")
+        return {"status": "success", "message": f"Resilver started on {pool_name}"}
+    except HTTPException:
+        raise
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
 @router.post("/clear-cache")
 async def clear_cache(current_user: str = Depends(get_current_user)):
     """