- add VITE_CLIENT_ID environment variable to all .env files, adjust API and socket URLs across dev/staging/prod environments
- update request utility to use env var for client ID instead of hardcoded "6"
- refactor GoodDetail component: replace uni-icons with van-icon, switch markdown renderer to vue3-markdown-it
- refactor Calendar component: swap uni-popup for van-popup, remove deprecated SCSS styles, update markup and toast calls
- fix ImageSwiper: rename handler methods, update preview navigation to use vue router, remove redundant code
- correct margin class syntax in goods index page
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