feat(rename): rename project file and parent directory

[CalvinAllen]

Summary

Add functionality to rename the project file and parent directory on disk.

Changes Made

• Modified: Services/ProjectFileService.cs
  • Added RenameProjectFile() - Renames the .csproj file
  • Added RenameParentDirectoryIfMatches() - Renames parent folder if it matches project name
  • Uses full paths via Path and DirectoryInfo classes
  • Directory rename only occurs if folder name matches old name (case-insensitive)
  • Both methods return new path for subsequent operations
• Modified: Commands/RenamifyProjectCommand.cs
  • Calls directory rename first (moves entire folder)
  • Then calls file rename (renames just the .csproj)
  • Updated TODO comments

Example

Before: C:\Projects\MyProject\MyProject.csproj
After:  C:\Projects\NewName\NewName.csproj

Test Plan

• Build and debug the extension
• Test with project where folder matches project name - both should rename
• Test with project where folder differs from project name - only file should rename
• Verify paths are calculated correctly

Note

Solution will still be broken after this runs until #22, #23 are implemented.

Closes #20
Closes #21

[CalvinAllen]

Closing - overlaps with merged PR #24. Will create a clean PR for directory rename only.