🎨 chore(web): apply ESLint and Prettier auto-fixes (baseline)

- Ran: bun run eslint:fix && bun run lint:fix
- Inserted AGPL license header via eslint-plugin-header
- Enforced no-multiple-empty-lines and other lint rules
- Formatted code using Prettier v3 (@so1ve/prettier-config)
- No functional changes; formatting-only baseline across JS/JSX files

web/src/i18n/locales/en.json

@@ -2018,4 +2018,4 @@
   "查看渠道密钥": "View channel key",
   "渠道密钥信息": "Channel key information",
   "密钥获取成功": "Key acquisition successful"
-}
+}