refactor: 产品大图迁移OSS，小图标本地打包，资源基址改为.env配置

config/index.js

@@ -1,3 +1,5 @@
+const path = require('path')
+require('dotenv').config({ path: path.resolve(__dirname, '../.env') })
 const config = {
   projectName: 'smart-engraving-miniapp',
   date: '2026-7-20',
@@ -11,12 +13,12 @@ const config = {
   outputRoot: 'dist',
   plugins: [],
   defineConstants: {
+    __OSS_BASE_URL__: JSON.stringify(process.env.OSS_BASE_URL || ''),
   },
   copy: {
     patterns: [
-      { from: 'src/img', to: 'dist/img' },
-      { from: 'src/icon', to: 'dist/icon' }
-      ,{ from: 'src/theme.json', to: 'dist/theme.json' }
+      { from: 'src/icon', to: 'dist/icon' },
+      { from: 'src/theme.json', to: 'dist/theme.json' }
     ],
     options: {
     }