refactor: 移动端升级 Vue3 + uView Plus

将 lilishop-uniapp 从 Vue2/uView 1.6 迁移到 Vue3/uview-plus，优先支持 H5/微商城与微信小程序；移除 vendored uview-ui，改用 npm 依赖、Vuex4 与迁移脚本/补丁，并补充 VUE3_MIGRATION.md 回归清单。

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/migrate-navbar-props.js

@@ -0,0 +1,51 @@
+const fs = require('fs')
+const path = require('path')
+
+const root = path.join(__dirname, '..')
+
+function walk(dir, files = []) {
+  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+    if (['node_modules', '.git', 'scripts'].includes(entry.name)) continue
+    const full = path.join(dir, entry.name)
+    if (entry.isDirectory()) walk(full, files)
+    else if (entry.name.endsWith('.vue')) files.push(full)
+  }
+  return files
+}
+
+function fixNavbarLine(line) {
+  if (!line.includes('u-navbar')) return line
+  let result = line
+  result = result.replace(/:border-bottom="false"/g, ':border="false"')
+  result = result.replace(/:is-back="/g, ':auto-back="')
+  result = result.replace(/:custom-back="back"/g, ':auto-back="false" @leftClick="back"')
+  result = result.replace(/back-icon-color="/g, 'left-icon-color="')
+  result = result.replace(/:background="navbarOnlyBack"/g, ':bg-color="navbarOnlyBack.background"')
+  result = result.replace(/:background="navbar"/g, ':bg-color="navbar.background"')
+  result = result.replace(/:background="navObj"/g, ':bg-color="navObj.background"')
+  result = result.replace(/:background="background"/g, ':bg-color="background.backgroundColor"')
+  return result
+}
+
+function fixCellLine(line) {
+  if (!line.includes('u-cell') || !line.includes(':border-bottom')) return line
+  return line.replace(/:border-bottom="false"/g, ':border="false"')
+}
+
+function fixInputLine(line) {
+  if (!line.includes('u-input') || !line.includes(':border-bottom')) return line
+  return line.replace(/:border-bottom="false"/g, 'border="none"')
+}
+
+function processFile(file) {
+  const lines = fs.readFileSync(file, 'utf8').split('\n')
+  const updated = lines.map((line) => fixInputLine(fixCellLine(fixNavbarLine(line)))).join('\n')
+  const original = lines.join('\n')
+  if (updated !== original) {
+    fs.writeFileSync(file, updated)
+    console.log('updated', path.relative(root, file))
+  }
+}
+
+walk(root).forEach(processFile)
+console.log('navbar props migration done')