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feat: Add /reload HTTP endpoint for blocklist

Introduce a new HTTP endpoint `/reload` which allows users to
manually trigger an immediate update of the configured blocklists.

*   Exposes `BlocklistUpdater` to the HTTP server setup.
*   The `/reload` endpoint is protected by the same basic
    authentication configured for `/metrics`.
*   The handler returns HTTP 200 OK after running the update.
```mermaid
sequenceDiagram
    actor U as User
    participant H as HTTP Server
    participant B as BlocklistUpdater

    U->>H: GET /reload (Authenticated)
    H->>B: NewHandler().ServeHTTP()
    B->>B: Run() (Fetches and loads blocklists)
    B-->>H: Update finished
    H-->>U: HTTP 200 OK
```