enhance: support reading subfolders

[Haruko386]

Related to #18

Summary by CodeRabbit

• New Features

  • Added recursive discovery of supported image files within input directories.
  • Preserved input folder structure when saving depth predictions, including NumPy, grayscale PNG, and colored PNG outputs.

• Bug Fixes

  • Prevented non-file paths and unsupported file types from being processed.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 650705bb-0d60-4070-b3f7-2d978207b322

📥 Commits

Reviewing files that changed from the base of the PR and between 094c03b and 1cac553.

📒 Files selected for processing (1)

• run.py

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📝 Walkthrough

Walkthrough

run.py now discovers supported images recursively, excludes non-files, and preserves each image’s relative directory structure when saving NumPy, 16-bit PNG, and colored PNG predictions.

Changes

Recursive inference output

Layer / File(s)	Summary
Recursive image discovery run.py	Image discovery now traverses input_rgb_dir recursively, keeps regular files only, and filters supported extensions case-insensitively.
Mirrored prediction output run.py	NumPy, 16-bit PNG, and colored PNG predictions are saved in nested output directories matching each input image’s relative parent directory. Existing-file warnings target the nested paths.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description only links an issue and omits the required Summary, Type of Change, and Test Results sections.	Add the missing template sections: Summary, Type of Change, and Test Results, and briefly describe the change.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: recursive subfolder input support.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch moon

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