[kyuminjo]

Summary

Adds a PopNow custom endpoint guide under the LibreChat YAML AI endpoints docs, following the same structure as the NEAR AI Cloud guide.

The example uses:

• POPNOW_API_KEY
• https://api.popnow.ai/v1 (OpenAI-compatible Chat Completions and /v1/models)
• google/gemini-3.7-flash/chat and anthropic/claude-haiku-5.5/chat as the default models
• models.fetch: true so LibreChat loads the live model list

Also adds popnow to the sidebar meta.json and a card on the AI Endpoints index under "Other compatible endpoints". The page uses the existing Sparkles icon, so no new icon component is added.

Testing

• Prettier check with the repo config passes on the new page and meta.json
• The linked pages (popnow.ai/api, popnow.ai/api/console/keys, popnow.ai/docs/chat) return 200, and both default model IDs appear in the PopNow chat docs

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