rm-hull / next-departures-api / 25073731598

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feat: add cron job for periodic NaPTAN updates (#3)

Introduces a background worker to automatically refresh the NaPTAN
dataset at regular intervals.

- Added `github.com/robfig/cron/v3` dependency.
- Implemented a cron job that triggers every 19 hours.
- Centralized the NaPTAN dataset URL in `internal/models`.
- Updated `ApiServer` to initialize the scheduler on startup.
- Refined import logging frequency and messaging.

```mermaid
sequenceDiagram
    participant S as API Server
    participant C as Cron Scheduler
    participant E as External NaPTAN API
    participant R as Repository (SQLite)

    S->>C: StartCron(repo)
    loop Every 19 hours
        C->>E: Download CSV
        E-->>C: CSV Stream
        C->>R: ImportCSV()
        Note right of R: Transactional Update
        R-->>C: Done
    end
```

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

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