Add --thumbnails / --no-thumbnails flags to podcli process

[nmbrthirteen]

What

Adds an explicit CLI toggle for thumbnail generation on podcli process.

Thumbnail generation is already opt-in (it needs a brand thumbnail config and is off for new users), and the studio generates thumbnails on demand only — but there was no explicit switch to force it on or off for a CLI run.

How

Tri-state flags that set the existing generate_thumbnails config override:

• (unset) — keep the opt-in default
• --thumbnails — force on
• --no-thumbnails — skip

Verification

341 Python tests pass. Independent of #37 (touches only backend/cli.py).

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Review details

⚙️ Run configuration

Configuration used: defaults

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Run ID: 542714fa-d306-477d-99ab-f8c0feb606f0

📥 Commits

Reviewing files that changed from the base of the PR and between f19fcc7 and c2cacc7.

📒 Files selected for processing (1)

• backend/cli.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/thumbnail-preference

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[nmbrthirteen]

Reviewed: clean and independent. Tri-state --thumbnails/--no-thumbnails (default None) wired into config['generate_thumbnails'], which cli.py already reads at :742 as the opt-in override. Touches only backend/cli.py, no overlap with #36/#37. Merging.