Add routerbase gateway skill

[zenlee123]

Adds a compact Codex skill for integrating OpenAI-compatible apps with RouterBase.\n\nThe skill covers:\n\n- migrating OpenAI SDK/fetch/curl calls to RouterBase\n- configuring ROUTERBASE_API_KEY safely\n- choosing primary and fallback models\n- calling chat and media generation endpoints\n- avoiding API key and private data leakage\n\nUpdated README.md under the API category and added skills/api/routerbase-gateway/SKILL.md.\n\nValidation:\n\n- SKILL.md is 93 lines\n- Checked for accidental private email or real API key leakage\n- Ran git diff --cached --check

[gemini-code-assist]

Code Review

This pull request introduces a new skill, routerbase-gateway, which provides documentation and examples for integrating OpenAI-compatible applications with RouterBase for model routing and media generation. It also updates the main README.md to list this new skill. The review feedback recommends updating the image generation example to use the standard size parameter instead of non-standard aspect_ratio and resolution parameters to align with the OpenAI-compatible standard.

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[gemini-code-assist]

The image generation example uses non-standard parameters aspect_ratio and resolution. To adhere to the OpenAI-compatible standard (as highlighted in your Quality Bar), it is better to use the standard size parameter (e.g., "size": "1024x1024").

Suggested change

	"aspect_ratio": "1:1",
	"resolution": "1K"
	"size": "1024x1024"