loggeding/keyan-admin-7d9 — reverse-engineered prompt

Build me a campus second hand flea market web system based on this project. I want a simple working version where students can browse used items, search or filter them, view item details, and log in to post their own items for sale. There should also be an admin side to manage users, product listings, categories, and basic orders or messages if the existing code supports it.

Use the existing Java Spring Boot backend, MySQL database, and Vue front end that are already in the repo. Please wire it up so it runs locally without guesswork, import the SQL file, fix any broken config, and make the front end talk to the backend correctly. Keep the UI clean and practical with normal pages like login, home, item list, detail page, publish item, personal center, and admin dashboard.

If something is missing from the README, inspect the code and make reasonable choices. Look up current docs online if needed.