Add baoyu-skills package

baoyu-skills/skills/baoyu-image-gen/references/providers/openrouter.md

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+# OpenRouter
+
+Read when the user picks `--provider openrouter`. Default model is `google/gemini-3.1-flash-image`.
+
+## Common Models
+
+Use full OpenRouter model IDs:
+
+- `google/gemini-3.1-flash-image` (recommended — supports image output and reference-image workflows)
+- `google/gemini-2.5-flash-image-preview`
+- `black-forest-labs/flux.2-pro`
+- Any other OpenRouter image-capable model ID
+
+## Behavior Notes
+
+- OpenRouter image generation uses `/chat/completions`, not the OpenAI `/images` endpoints
+- `--ref` requires a multimodal model that supports both image input and image output
+- `--imageSize` maps to `imageGenerationOptions.size`
+- `--size <WxH>` is converted to the nearest supported OpenRouter size, and the aspect ratio is inferred when possible