Initial release of pinduoduo-hot-trend skill.

- Enables information retrieval and light analysis for public product and event pages on Pinduoduo.
- Provides summaries of product listings and details (price ranges, review counts, promotion types).
- Supports lightweight competitive comparison of similar products by brand/specs/pricing.
- Only works with publicly available web pages; does not support ordering or bypassing platform protections.
- Reminds users to follow platform rules and avoid batch data collection.