This PR separates the monolithicNode class into specializedFileNode andDirNode classes that inherit from a common abstractNode base class, improving code organization and type safety.

Changes Made

• AbstractNode base class: Contains common functionality like timestamps, permissions, mode, uid/gid, symlink support, and permission checks
• FileNode class: ExtendsNode with file-specific operations (getString(),setString(),getBuffer(),setBuffer(),write(),read(),truncate(), and thebuf property)
• DirNode class: ExtendsNode for directories (no buffer operations needed)
• Smart node creation: UpdatedSuperblock.createNode() to instantiate the appropriate node type based on file mode (S_IFDIR →DirNode, otherwise →FileNode)
• Updated exports: AddedFileNode andDirNode to module exports alongside the baseNode class

Benefits

• Better separation of concerns: File-specific operations are now isolated toFileNode
• Type safety: Abstract base class prevents direct instantiation of the genericNode class
• Backward compatibility: All existing APIs continue to work exactly as before
• Memory efficiency: Directory nodes no longer carry unnecessary buffer-related properties

Testing

• All existing tests pass without modification (except updating the node-specific test to useFileNode)
• Manual verification confirms both node types work correctly with their respective operations
• Build and linter checks pass successfully

The implementation maintains full backward compatibility while providing a cleaner, more maintainable codebase structure.

Fixes#1181.

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