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feat: Add scheduled DNS cache reaper (#23)

* feat: Add scheduled DNS cache reaper

Implements an automated cron job to regularly clean up
expired entries from the DNS cache.

- Runs every 10 minutes (`@every 10m`).
- Adds `dns_cache_reaper_calls` metric to monitor usage.

Fixes #8

* refactor: Rename generic cron jobs for clarity

The generic `CronJob` structures and constructors have been
renamed to better reflect their responsibilities:

*   Blocklist cron job renamed to `Downloader`.
*   Forwarder cron job renamed to `CacheReaper`.

* feat: Separate cron job schedules

The blocklist downloader and the cache reaper jobs now have
independent, configurable schedules.

This allows users to configure the refresh frequency for the
blocklist (default `@every 19h`) separately from the frequency
of the internal cache cleaning (default `@every 10m`).

- Updates the `App` structure to hold separate schedules.
- Introduces flags `--cron-schedule:downloader` and
  `--cron-schedule:cache-reaper`.

* Update internal/forwarder/cache_reaper.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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