feat: Add Chinese platform support (Xiaohongshu, Bilibili, WeChat)

[howardpen9]

Problem

Chinese social media platforms — Xiaohongshu (小紅書), Bilibili, and WeChat Official Accounts (微信公眾號) — have massive user bases but no public APIs for direct publishing. This forces a "copy-ready" workflow where agents can only format content and provide manual instructions, creating significant friction.

Use Case

• Cross-post content to Chinese platforms as part of a multilingual distribution strategy
• Reach Chinese-speaking audiences without maintaining a separate manual workflow
• Support the growing demand for EN→ZH content localization and cross-posting

Context

In our cross-posting pipeline, we implemented a dual-track architecture:

• Direct Publish (via Typefully): X, LinkedIn, Threads
• Copy-Ready (manual): Xiaohongshu, Bilibili, WeChat

The copy-ready approach works but is the biggest friction point in the entire workflow. Users need to manually open each platform, paste content, adjust formatting, and publish — for every single post.

Challenges

These platforms don't offer standard REST APIs for content publishing. Possible approaches:

• Browser automation (Playwright/Puppeteer)
• Mobile API reverse-engineering (fragile, ToS concerns)
• Official partnerships or developer programs
• Enhanced copy-ready with deep-linking to reduce manual steps

Suggested Scope (incremental)

1. Phase 1: Enhanced copy-ready — platform-specific formatting, deep links, clipboard integration
2. Phase 2: Xiaohongshu web publishing (if API or automation becomes viable)
3. Phase 3: Bilibili article publishing (Bilibili has some developer APIs)
4. Phase 4: WeChat Official Account API (requires verified account)

Platforms

Platform	Users	Content Type	API Status
Xiaohongshu (小紅書)	300M+	Image + text notes	No public API
Bilibili	400M+	Articles, videos	Partial (article API exists)
WeChat Official (微信公眾號)	1B+	Articles	Official API (requires verification)