feat: Add WeChat posting skill and update marketplace.json

skills/post-to-wechat/references/image-text-posting.md

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+# Image-Text Posting (图文发表)
+
+Post image-text messages with multiple images to WeChat Official Account.
+
+## Usage
+
+```bash
+# Post with images and markdown file (title/content extracted automatically)
+npx -y bun ./scripts/wechat-browser.ts --markdown source.md --images ./images/
+
+# Post with explicit title and content
+npx -y bun ./scripts/wechat-browser.ts --title "标题" --content "内容" --image img1.png --image img2.png
+
+# Save as draft
+npx -y bun ./scripts/wechat-browser.ts --markdown source.md --images ./images/ --submit
+```
+
+## Parameters
+
+| Parameter | Description |
+|-----------|-------------|
+| `--markdown <path>` | Markdown file for title/content extraction |
+| `--images <dir>` | Directory containing images (sorted by name) |
+| `--title <text>` | Article title (max 20 chars, auto-compressed if too long) |
+| `--content <text>` | Article content (max 1000 chars, auto-compressed if too long) |
+| `--image <path>` | Single image file (can be repeated) |
+| `--submit` | Save as draft (default: preview only) |
+| `--profile <dir>` | Chrome profile directory |
+
+## Auto Title/Content from Markdown
+
+When using `--markdown`, the script:
+
+1. **Parses frontmatter** for title and author:
+   ```yaml
+   ---
+   title: 文章标题
+   author: 作者名
+   ---
+   ```
+
+2. **Falls back to H1** if no frontmatter title:
+   ```markdown
+   # 这将成为标题
+   ```
+
+3. **Compresses title** to 20 characters if too long:
+   - Original: "如何在一天内彻底重塑你的人生"
+   - Compressed: "一天彻底重塑你的人生"
+
+4. **Extracts first paragraphs** as content (max 1000 chars)
+
+## Image Directory Mode
+
+When using `--images <dir>`:
+
+- All PNG/JPG files in directory are uploaded
+- Files are sorted alphabetically by name
+- Naming convention: `01-cover.png`, `02-content.png`, etc.
+
+## Constraints
+
+| Field | Max Length | Notes |
+|-------|------------|-------|
+| Title | 20 chars | Auto-compressed if longer |
+| Content | 1000 chars | Auto-compressed if longer |
+| Images | 9 max | WeChat limit |
+
+## Example Session
+
+```
+User: /post-to-wechat --markdown ./article.md --images ./xhs-images/
+
+Claude:
+1. Parses markdown meta:
+   - Title: "如何在一天内彻底重塑你的人生" → "一天内重塑你的人生"
+   - Author: from frontmatter or default
+2. Extracts content from first paragraphs
+3. Finds 7 images in xhs-images/
+4. Opens Chrome, navigates to WeChat "图文" editor
+5. Uploads all images
+6. Fills title and content
+7. Reports: "Image-text posted with 7 images."
+```
+
+## Scripts
+
+| Script | Purpose |
+|--------|---------|
+| `wechat-browser.ts` | Main image-text posting script |
+| `cdp.ts` | Chrome DevTools Protocol utilities |
+| `copy-to-clipboard.ts` | Clipboard operations |