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_bsd.go

@@ -54,7 +54,7 @@ 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
@@ -64,7 +64,7 @@ func CheckDiskSpaceForRestore(path string, archiveSize int64) *DiskSpaceCheck {
 		check.Warning = true
 		check.Sufficient = false
 	}
-	
+
 	return check
 }
 
@@ -108,4 +108,4 @@ func FormatDiskSpaceMessage(check *DiskSpaceCheck) string {
 	}
 
 	return msg
-}
+}