Fix local remove deleting a version in use by a running server

[sdairs]

Fixes #257.

Problem

chctl local remove <version> deleted the installed binary directory unconditionally. If a local server was running on that version, the binary was pulled out from under it — local remove reported success while local server list still showed the server running, now pointing at a deleted binary.

Fix

local remove <version> now:

• Recovers orphaned servers, then refuses to delete a version that a running server is using, failing with a new VersionInUse error that lists the running server name(s): "Version X is in use by running server(s): default. Stop them first, or pass --force." (exit code 1, nothing deleted).
• Accepts --force to stop the running server(s) first (printing Stopped server '<name>'), then proceed with the existing default-version/symlink cleanup and removal.

Reuses the same guard pattern as server remove (recover_current_project_servers, list_running_servers, kill_server). Detection/stop is current-project scoped, consistent with those helpers, which covers the reported in-project bug.

Changes

• src/error.rs — new VersionInUse { version, servers } variant (+ exit-code test).
• src/local/cli.rs — --force flag on Remove, updated help text, two parse tests.
• src/local/mod.rs — running-server guard in remove().
• README.md — documented the guard and --force.

Verification

• cargo build and cargo clippy clean (no warnings).
• cargo test -p clickhousectl — all passing, including the new parse and exit-code tests.

🤖 Generated with Claude Code

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Note

Low Risk
Localized CLI safety change around version removal; reuses existing server stop/discovery helpers with tests and docs.

Overview
clickhousectl local remove no longer deletes an installed ClickHouse binary if a local server in the current project is still running on that version. It recovers orphaned servers, lists matching running instances, and fails with VersionInUse (exit 1) naming those servers unless you stop them first.

Adds --force on local remove to stop those servers via the existing kill_server path, print Stopped server '<name>', then run the usual default-version / symlink cleanup and directory removal. CLI help, README, a new error variant (+ exit-code test), and Remove parse tests document and cover the behavior.

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[iskakaushik]

LGTM