Add RunAPI CLI

[runapi-builder]

Description

Adds RunAPI CLI to the CLI Utilities section for running AI image, video, music, audio, and LLM jobs from scripts, CI, or agents.

Checklist

• The entry is a tool that uses AI
• The entry is a developer-focused tool
• The description is unambiguous and clear
• The description matches the style of other entries

[github-actions]

👋 Hi @runapi-builder,
Thank you for your contribution! However, this PR doesn't follow our PR template requirements.
Issues found:

• Missing required section: ## Description
• Missing required section: ## Checklist
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[runapi-builder]

Updated the PR description to match the template.