Enhance FileInfo structure and DiskFS functionality

- Added CTime (creation time) and AccessCount fields to FileInfo struct for better file metadata tracking.
- Updated NewFileInfo and NewFileInfoFromOS functions to initialize new fields.
- Enhanced DiskFS to maintain access counts and file metadata, including flushing to JSON files.
- Modified Open and Create methods to increment access counts and set creation times appropriately.
- Updated garbage collection logic to utilize real access counts for files.

vfs/gc/gc.go

@@ -308,25 +308,23 @@ func getAllFiles(vfss vfs.VFS) []fileInfoWithMetadata {
 	case *disk.DiskFS:
 		allFiles := fs.StatAll()
 		for _, fi := range allFiles {
-			// For disk, we can't easily track access count, so we'll use 1 as default
 			files = append(files, fileInfoWithMetadata{
 				Name:        fi.Name(),
 				Size:        fi.Size(),
 				MTime:       fi.ModTime(),
 				ATime:       fi.AccessTime(),
-				AccessCount: 1,
+				AccessCount: fi.AccessCount, // Use real access count
 			})
 		}
 	case *memory.MemoryFS:
 		allFiles := fs.StatAll()
 		for _, fi := range allFiles {
-			// For memory, we can't easily track access count, so we'll use 1 as default
 			files = append(files, fileInfoWithMetadata{
 				Name:        fi.Name(),
 				Size:        fi.Size(),
 				MTime:       fi.ModTime(),
 				ATime:       fi.AccessTime(),
-				AccessCount: 1,
+				AccessCount: fi.AccessCount, // Use real access count
 			})
 		}
 	}