chore(style): bulk shfmt v3.13.1 reformat across all scripts

[bakerboy448]

Summary

• Restores Pre-commit CI to green. Repo's main has been failing since 2026-04-18 because pre-commit-config pinned shfmt v3.13.1-1, but the repo files were formatted by an older shfmt version with different rules.
• Pure formatting changes — no semantic effects.

Changes

• 4-space → 2-space indent
• pipe-at-EOL → \ continuation with pipe-at-BOL (--binary-next-line flag)
• minor whitespace normalisation

12 .sh files touched; shellcheck --severity=warning clean across all.

Test plan

• Pre-commit CI passes (it's been red for 3 weeks; this should fix it)
• shfmt --diff is empty repo-wide after merge
• No behavioral changes (formatting only)

Notes

This unblocks #38 (qbm-qbit + notifiarr-branch-builder cherry-pick), which inherits the broken Pre-commit run from main.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 0fc39965-f1bb-4ae1-9435-dc439c33a255

📥 Commits

Reviewing files that changed from the base of the PR and between 77a0845 and f2f0ed2.

📒 Files selected for processing (12)

• dupe.sh
• f2b-dump.sh
• omegabrr_upgrade.sh
• pic-update.sh
• pmm-update.sh
• qbm-api-trigger.sh
• qbm-update.sh
• qui-xseed.sh
• radarr_dupefinder.sh
• servarr/servarr_bot_merge.sh
• sonarr_dupefinder.sh
• zfsburn.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore-shfmt-v3.13.1-bulk-reformat

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