ci: add golangci-lint config and fix formatting

- Add .golangci.yml with minimal linters (govet, ineffassign)
- Run gofmt -s and goimports on all files to fix formatting
- Disable fieldalignment and copylocks checks in govet

internal/checks/disk_check_windows.go

@@ -29,7 +29,7 @@ func CheckDiskSpace(path string) *DiskSpaceCheck {
 		// If no volume, try current directory
 		vol = "."
 	}
-	
+
 	var freeBytesAvailable, totalNumberOfBytes, totalNumberOfFreeBytes uint64
 
 	// Call Windows API
@@ -73,7 +73,7 @@ func CheckDiskSpace(path string) *DiskSpaceCheck {
 func CheckDiskSpaceForRestore(path string, archiveSize int64) *DiskSpaceCheck {
 	check := CheckDiskSpace(path)
 	requiredBytes := uint64(archiveSize) * 4 // Account for decompression
-	
+
 	// Override status based on required space
 	if check.AvailableBytes < requiredBytes {
 		check.Critical = true
@@ -83,7 +83,7 @@ func CheckDiskSpaceForRestore(path string, archiveSize int64) *DiskSpaceCheck {
 		check.Warning = true
 		check.Sufficient = false
 	}
-	
+
 	return check
 }
 
@@ -128,4 +128,3 @@ func FormatDiskSpaceMessage(check *DiskSpaceCheck) string {
 
 	return msg
 }
-