zzstar101/fish

FISH (鱼小应) is a campus-only secondhand marketplace built around on-campus, in-person handoffs—not platform payment or shipping. A user signs in, finds or publishes a listing, and can chat with its owner; a buyer can also post a wish, which the background worker matches against listings and turns into an in-app notification. The parties can then propose and complete a meetup transaction. Groups reflect product stages and supporting runtime layers. The README documents several capabilities whose detailed source was not sampled; those are represented at domain level without implying unverified internal calls.