Add option to compact leveldb to repo fsck

Description

Contributor guide

Tech stack

go

Domain

backend

Issue type

feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

half day

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

mostly clear

Prerequisites

Go programmingIPFS internalsLevelDB

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

20

Research direction

First, review the context in issue #3763 to understand the original discussion. Then, examine the `repo fsck` command implementation in the kubo codebase, likely in a file like `core/commands/repo.go`. Look for existing options and how they are parsed. The compact option should invoke LevelDB's compact method. Consider adding a flag like ` compact` to the fsck command. Also check if there are any existing PRs or comments addressing this feature.