fix(search): read --force-rescan flag with its registered name

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The `opencloud search index` command registers the flag as
`--force-rescan` (see pflag registration below) but reads it via
`GetBool("force-reindex")`, so the value is always false — passing
`--force-rescan` had no effect and no force rescan was ever triggered.

Read the flag under its registered name.

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