rm-hull / dot-block / 19199454108

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feat: Implement scheduled blocklist reloading (#17)

* feat: Implement scheduled blocklist reloading

This introduces automatic periodic reloading of the blocklist via a
configurable cron schedule.

- Adds the `robfig/cron/v3` dependency.
- Introduces the `--cron-schedule` flag (default: `@every 19h`).
- Refactors `BlockList` initialization to support dynamic
loading/reloading.
- Updates metrics (`blocklist_age`, `blocklist_reloads`) to track reload
  status and frequency.

* fix: Protect BlockList access with RWMutex

The `BlockList` was not thread-safe, leading to potential data
races when the bloom filter was accessed during a reload.

This introduces an `RWMutex` to ensure safe concurrent access:
*   Use write lock during replacement in `Load`.
*   Use read lock during checks in `IsBlocked`.

* fix: Improve cron job error handling and recovery

Enhance robustness by ensuring scheduled tasks fail gracefully
and application startup errors are handled correctly.

*   Added `cron.Recover` middleware to prevent the application
    from crashing if a scheduled job panics.
*   Changed blocklist download failures during cron runs from
    panicking to logging an error.
*   Handle errors returned when attempting to add the cron job
    during application initialization.

* fix: Set initial blocklist update time

* style: Fix typo in cron-schedule help text

The help message for the `--cron-schedule` flag was malformed,
including an extra closing backtick and parenthesis.

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