Add baoyu-skills package

baoyu-skills/skills/baoyu-post-to-wechat/references/api-setup.md

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+# API Credential Setup
+
+Guided setup when `WECHAT_APP_ID` / `WECHAT_APP_SECRET` are missing. Invoked by Step 2 of the article-posting workflow.
+
+## Detection
+
+Look for the credentials in this order:
+
+1. Env vars `WECHAT_APP_ID` / `WECHAT_APP_SECRET`
+2. `<cwd>/.baoyu-skills/.env` with `WECHAT_APP_ID=...`
+3. `$HOME/.baoyu-skills/.env` with `WECHAT_APP_ID=...`
+
+If none are present, run the guided setup below.
+
+## Guided Setup
+
+Show this message to the user and ask where to save:
+
+```
+WeChat API credentials not found.
+
+To obtain credentials:
+1. Visit https://mp.weixin.qq.com
+2. Go to: 开发 → 基本配置
+3. Copy AppID and AppSecret
+
+Where to save?
+A) Project-level: .baoyu-skills/.env (this project only)
+B) User-level: ~/.baoyu-skills/.env (all projects)
+```
+
+After they choose a location, collect the values (prefer a user-input tool, fall back to a numbered prompt per the User Input Tools rule in SKILL.md) and append:
+
+```
+WECHAT_APP_ID=<user_input>
+WECHAT_APP_SECRET=<user_input>
+```
+
+## Multi-Account Variant
+
+If the user has multiple accounts configured (`accounts:` block in EXTEND.md), use prefixed keys instead — see `multi-account.md` → "Credential Resolution".