rm-hull / metoffice-uk-weather-overlays / 23690962134

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feat: add cleanup job for old forecast files (#64)

* feat: add cleanup job for old forecast files

Implement a scheduled task to remove forecast files older than 7 days
to prevent storage overflow.

```mermaid
sequenceDiagram
    participant Cron
    participant CleanupJob
    participant FS

    Cron->>CleanupJob: Trigger at 01:00
    CleanupJob->>FS: Walk root directory
    FS-->>CleanupJob: File path
    CleanupJob->>CleanupJob: Validate date/hour
    CleanupJob->>FS: Remove file if old
```

* refactor: use AddDate for 7-day cutoff calculation

Replace manual duration calculation with `AddDate(0, 0, -7)` for better
readability and to correctly handle daylight saving time transitions.

* chore: add logging for cron cleanup errors

Add error logging during `filepath.WalkDir` to improve
observability when the cleanup process encounters
unexpected file structures or parsing issues.

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