DomainDig v4.2.0: Add a local-only HTTP API layer for DomainDig

Expose DomainDig as a programmable local domain intelligence engine over
localhost with explicit user opt-in and token-based authentication.

Highlights:
- add a localhost-only API server with safe start/stop lifecycle
- require a local token for every request and store it in Keychain
- add read endpoints for portfolio, domains, history, events, and monitoring
- add inspection endpoints that reuse the existing inspection engine
- add monitoring enable/disable control endpoints
- add structured JSON response envelopes with API versioning
- add lightweight capped request logging with clear/reset support
- add a Settings UI for Local API enablement, token management, status, and logs
- start the server on launch only when enabled
- include Local API secrets in local data reset cleanup

This is the first programmability release for DomainDig and establishes the
foundation for Shortcuts, scripts, and other local automation workflows.

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