rm-hull / next-departures-api / 25082875742

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feat: add refdata endpoint for stop types (#5)

Introduces a new API route `/v1/next-departures/refdata/stop-types` to
provide metadata about transport stop types.

- Embeds static reference data from `stop-types.json` using `go:embed`.
- Returns a list of codes, descriptions, and categories (e.g., **bus**,
**rail**, **metro**).
- Facilitates client-side filtering and labeling of NaPTAN stops.

```mermaid
sequenceDiagram
    participant Client
    participant API as API Server
    participant Routes
    participant Models

    Client->>API: GET /v1/.../refdata/stop-types
    API->>Routes: StopTypes(context)
    Routes->>Models: Access global StopTypes
    Models-->>Routes: []StopType (unmarshaled from embedded JSON)
    Routes-->>Client: 200 OK (JSON array)
```

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

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