⚡ Bolt: Replace filepath.Walk with filepath.WalkDir

[MagdielCAS]

💡 What: Replaced filepath.Walk with filepath.WalkDir in internal/cli/docker/compose/command.go when searching for Dockerfiles in the project. Added an inline comment explaining the optimization.

🎯 Why: filepath.Walk calls os.Lstat for every file and directory it encounters, which introduces significant overhead. filepath.WalkDir, introduced in Go 1.16, passes an os.DirEntry to the walk function instead of an os.FileInfo, avoiding the os.Lstat call altogether in most cases. This results in much faster directory traversal.

📊 Impact: Directory scanning operations (like searching for Dockerfiles) will be significantly faster, especially on large codebases with deep directory structures. The exact impact scales linearly with the number of files and directories in the repository, reducing expensive system calls.

🔬 Measurement: Run the magi docker compose command on a repository with a large number of nested files and directories (e.g., node_modules or large mono-repos). Measure the time taken before and after the change; the operation should complete faster and consume less CPU time.

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PR created automatically by Jules for task 5986704310141967232 started by @MagdielCAS

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