#995 Implement unified UI automation framework (Qt HTTP Server + Playwright)

[magnesj]

Implements the unified UI automation framework from #995 (investigation #993, recommendation #994).

One localhost automation surface serves both UI workflow tests and AI tooling:

• Transport: localhost-only HTTP API exposed from ResInsight using Qt HTTP Server (qthttpserver), targeting Qt 6.6.3. New module ApplicationLibCode/Automation/ (RiaAutomationServer), gated behind the new CMake option RESINSIGHT_ENABLE_UI_AUTOMATION (OFF by default) and started with ResInsight --automationserver [port].
• API contract: OpenAPI 3.0 spec docs/automation/openapi.yaml is the source of truth, covering /health, /project, /objects/{address} (+ field write), /views, /views/{id}/visibleCellCount, and /commands (RICF).
• Test runner: Playwright project Testing/UiAutomation/ with read-only smoke tests and the cell-range-filter reference workflow from Framework used for AI tooling and UI unit tests #993.

The server binds to 127.0.0.1 only. Field writes reuse the same scripting capability as the Python/gRPC interface; command execution reuses the RICF command vocabulary.

Notes

• The feature is fully gated; with the option OFF the default build is unchanged.
• Building the server requires a Qt with the HttpServer module (present in the local Qt 6.6.3 install; not in the Qt 6.10.1 kit currently configured in build/).
• The end-to-end create/delete lifecycle test is marked fixme pending /commands vocabulary for creating/removing cell range filters.

Closes #995