flclash: Patch for recovering app built-in manifest.json

[AkariiinMKII]

To solve the bug caused by file conflictions, this PR adds a backup script for conflicted file and prints notes for users to act

Closes #18529

• Use conventional PR title: <manifest-name[@version]|chore>: <general summary of the pull request>
• I have read the Contributing Guide

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No actionable comments were generated in the recent review. 🎉

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Reviewing files that changed from the base of the PR and between da8fbe6 and 7d51c4e.

📒 Files selected for processing (1)

• bucket/flclash.json

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📝 Walkthrough

Walkthrough

The flclash manifest now includes a post_install script. The script renames manifest.json to manifest.flclash.json and prints TUN mode recovery instructions. The instructions include commands to restore the original manifest names.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: 🔵 Low · up to 7d51c

The change adds automatic backup and recovery guidance for a conflicting manifest file. It is mergeable with explicit owner follow-up to verify the full install and recovery flow, including manifest contents and supported architectures.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the flclash manifest recovery change and follows the repository’s conventional title format.
Description check	✅ Passed	The description explains the file conflict fix, links the relevant issue, and confirms both required checklist items.
Linked Issues check	✅ Passed	The change addresses issue #18529 by backing up the conflicting manifest and providing instructions to restore it for TUN mode.
Out of Scope Changes check	✅ Passed	The seven added lines are limited to the manifest recovery script and related user instructions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[AkariiinMKII]

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[github-actions]

All changes look good.

Wait for review from human collaborators.

flclash

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[z-Fng]

Would extracting to a subfolder to avoid overwriting manifest.json be a better approach? This wouldn't break other features.

Looks like someone else has already implemented the method I proposed (#18531).

Thank you for your contribution! Closing this PR as it is superseded by #18531.