fix(orphanscan): ignore .parts files from qBittorrent partial downloads

[s0up4200]

qBittorrent leaves .parts files when downloading partial torrents. These
should not be treated as orphans.

Adds a new suffix ignore pattern for *.parts files to the default ignore
list, alongside the existing prefix patterns for FUSE/NFS hidden files.

Summary by CodeRabbit

Bug Fixes

• Orphan scan now ignores qBittorrent partial download files (*.parts)

Documentation

• Added documentation for ignored file patterns

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

The pull request extends the orphan file scanner to ignore qBittorrent partial download files (*.parts suffix) through a new case-insensitive suffix filter. Changes include documentation of the new ignore pattern, implementation of a suffix-matching helper function, integration into the existing orphan detection logic, and test coverage for the new functionality.

Changes

Cohort / File(s)	Summary
Documentation documentation/docs/_partials/_orphan-scan-default-ignores.mdx	Added "Ignored files (name suffixes)" section documenting the new *.parts pattern for qBittorrent partial downloads.
Orphan Scanner Logic internal/services/orphanscan/walker.go	Added ignoredOrphanFileNameSuffixes list containing ".parts" and new hasSuffixFold() helper for case-insensitive suffix matching; extended isIgnoredOrphanFileName() to check suffixes.
Test Coverage internal/services/orphanscan/walker_test.go	Added TestWalkScanRoot_IgnoresPartsFiles() to verify that .parts files are ignored while regular orphans are still detected.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• fix(orphanscan): ignore OS/NAS/k8s artifacts #1259: Extends the same orphan-scan walker logic with multiple file/directory ignore lists and additional ignore helpers, directly related to this PR's orphan ignore rule expansion.

Suggested labels

orphan

Poem

🐰 Hopping through partial files with care,
The .parts stay hidden, not a pair!
With suffixes matched and case ignored,
Our orphan scan brings sweet reward! 🎉

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: ignoring .parts files from qBittorrent in the orphanscan service.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch claude/ignore-parts-files-L1OgQ

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}