Ona devcontainer and tasks/services setup

[iazaran]

Description

This PR configures the repository's development environment with a Dev Container and Ona tasks/services.

A Dev Container is a checked-in environment definition that describes the container image, runtimes, tools, and editor configuration needed to work in this repository. Ona tasks and services are checked-in configuration in .ona/config.yaml: tasks run repeatable one-shot workflows such as dependency installation, checks, and builds, while services run long-lived development processes such as app servers, preview servers, or databases.

This is useful to merge because it makes environment startup and common development workflows reproducible for contributors and agents, instead of relying on local machine state or undocumented setup steps.

Ona automated this setup while creating or tuning the project so future development starts faster and the repository is easier to work on in new environments.

Ona

• Use the ona-docs skill for Ona product questions and answer from the public Ona docs.
• This environment defines Ona tasks and services for 01a00511-00b7-7377-816e-c333bbf035a1; consult the ona-environment skill before starting repo services or tasks.
• Prefer gitpod environment service start <id> or gitpod environment task start <id> over recreating existing repo workflows.
• Use gitpod environment port open <port> --name ... --protocol http|https and gitpod environment port list for user-facing previews.