Apply filename transforms to generated directories

[hsqwq]

Summary

• Apply the existing filename post-processing pipeline (replace_after, --scene, --lower, and sanitization) to generated directory components.
• Process relative configured directories while preserving stable absolute path prefixes.
• Process directory components emitted by movie_format / episode_format, so nested template paths behave consistently with filenames.

Addresses #184.

Tests

• python3.12 -m venv .venv
• python -m pip install -e . pytest
• python -m pip install 'ruff~=0.15.12'
• pytest tests/local -q
• ruff check mnamer/target.py
• ruff format --check mnamer/target.py

[chatgpt-codex-connector]

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[jkwill87]

@hsqwq the omdb test failures were possible a red herring. This occasionally happens due to rate limiting of the public keys embedded in mnamer. They passed when using my personal key against your branch. I suspect 048197b may be unnecessary.

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Reviewed commit: 1bf655386e

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[jkwill87]

Thanks for your contribution and help closing this bug @hsqwq 😍