chore: reorganize icons for environment-specific deployment

Move environment-specific icons into dedicated directories (icons/develop, icons/test, icons/production) and update release scripts to copy the appropriate icon set (favicon.ico, Icon-192.png, Icon-512.png) into public/ for each target environment. Update manifest.json to reference the new /images/icons/ path.

scripts/release/release_web.sh

@@ -6,7 +6,7 @@
 #
 # 改动：
 #   - WORKTREE_PATH 改为 Next.js 项目对应 worktree
-#   - 删除图标复制（Next.js favicon 统一为 public/favicon.ico，不分 env）
+#   - 图标复制路径适配 Next.js（icons/production/icons/Icon-*.png）
 # ==========================================
 
 # Main 分支 worktree 路径
@@ -21,8 +21,11 @@ git branch --show-current
 echo "=== 合并 dev 分支 ==="
 git merge dev
 
-# 注：原 Dart 版会复制 icons/production/favicon.ico + Icon-{192,512}.png 到 web/
-# Next.js 项目 public/favicon.ico 是单一资产，不分 env，无需复制。
+# 复制生产环境图标（source: icons/production → dest: public/）
+echo "=== 复制生产环境图标（icons/production → public/） ==="
+cp -f icons/production/favicon.ico public/favicon.ico
+cp -f icons/production/icons/Icon-192.png public/images/icons/Icon-192.png
+cp -f icons/production/icons/Icon-512.png public/images/icons/Icon-512.png
 
 echo "=== 执行构建部署脚本 ==="
 ./scripts/deploy/deploy_web.sh