rm-hull / dot-block / 29655947777

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feat: add temporal blocklist disable functionality (#207)

* feat: add temporal blocklist disable functionality

Introduced a mechanism to temporarily bypass the blocklist, allowing for
 troubleshooting or maintenance. Added administrative HTTP endpoints to
manage this state and view the current blocklist status.

### Data Flow
```mermaid
sequenceDiagram
    participant User
    participant Handler as BlocklistHandler
    participant BL as BlockList

    User->>Handler: POST /blocklist/disable
    Handler->>BL: Disable(duration)
    BL->>BL: Set disabledUntil timestamp

    Note over User, BL: Subsequent DNS queries check disabledUntil

    User->>Handler: POST /blocklist/reenable
    Handler->>BL: Reenable()
    BL->>BL: Clear disabledUntil
```

* fix: correct blocklist status API and add validation

- Fix typo in `BlocklistStatus` struct (`Unitl` -> `Until`).
- Update `Status()` to return `nil` for `Until` if not disabled.
- Add validation to `Disable` handler to ensure positive duration.
- Remove redundant log statement in `IsBlocked`.

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