fix: close volumes and EC shards in tests for Windows compatibility (#8152)

* fix: close volumes and EC shards in tests to prevent Windows cleanup failures

On Windows, t.TempDir() cleanup fails when test files are still open
because Windows enforces mandatory file locking. Add defer v.Close(),
defer store.Close(), and EC volume cleanup to ensure all file handles
are released before temp directory removal.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* refactor: extract closeEcVolumes helper to reduce duplication

Address code review feedback by extracting the repeated EC volume
cleanup loop into a closeEcVolumes() helper function.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

weed/storage/disk_location_ec_test.go

@@ -11,6 +11,13 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/util"
 )
 
+// closeEcVolumes closes all EC volumes in the given DiskLocation to release file handles.
+func closeEcVolumes(dl *DiskLocation) {
+	for _, ecVol := range dl.ecVolumes {
+		ecVol.Close()
+	}
+}
+
 // TestIncompleteEcEncodingCleanup tests the cleanup logic for incomplete EC encoding scenarios
 func TestIncompleteEcEncodingCleanup(t *testing.T) {
 	tests := []struct {
@@ -182,11 +189,18 @@ func TestIncompleteEcEncodingCleanup(t *testing.T) {
 				t.Logf("loadAllEcShards returned error (expected in some cases): %v", loadErr)
 			}
 
+			// Close EC volumes before idempotency test to avoid leaking file handles
+			closeEcVolumes(diskLocation)
+			diskLocation.ecVolumes = make(map[needle.VolumeId]*erasure_coding.EcVolume)
+
 			// Test idempotency - running again should not cause issues
 			loadErr2 := diskLocation.loadAllEcShards(nil)
 			if loadErr2 != nil {
 				t.Logf("Second loadAllEcShards returned error: %v", loadErr2)
 			}
+			t.Cleanup(func() {
+				closeEcVolumes(diskLocation)
+			})
 
 			// Verify cleanup expectations
 			if tt.expectCleanup {
@@ -554,6 +568,9 @@ func TestEcCleanupWithSeparateIdxDirectory(t *testing.T) {
 	if loadErr != nil {
 		t.Logf("loadAllEcShards error: %v", loadErr)
 	}
+	t.Cleanup(func() {
+		closeEcVolumes(diskLocation)
+	})
 
 	// Verify cleanup occurred in data directory (shards)
 	for i := 0; i < erasure_coding.TotalShardsCount; i++ {
@@ -625,6 +642,9 @@ func TestDistributedEcVolumeNoFileDeletion(t *testing.T) {
 	if loadErr != nil {
 		t.Logf("loadAllEcShards returned error (expected): %v", loadErr)
 	}
+	t.Cleanup(func() {
+		closeEcVolumes(diskLocation)
+	})
 
 	// CRITICAL CHECK: Verify shard files still exist (should NOT be deleted)
 	for i := 0; i < 5; i++ {