feat: 新增实验性微信卡片分享与自动部署能力

补充 Cloudflare Worker、R2 存储、微信 JS-SDK 签名与上传鉴权
增加自动部署 Skill 和配置引导文档
优化报告工具栏、微信卡片弹窗及窄屏响应式布局
补充 Worker 鉴权、卡片生成、过期清理与安全转义测试

services/share-card-worker/README.md

@@ -0,0 +1,26 @@
+# WechatExplorer share-card worker
+
+Cloudflare Worker + private R2 service for temporary WeChat report cards.
+
+This is an experimental, self-hosted feature. See the complete Chinese deployment guide:
+
+- `../../docs/deployment/experimental-wechat-share-card.md`
+
+Required encrypted secrets:
+
+- `WECHAT_APP_ID`
+- `WECHAT_APP_SECRET`
+- `UPLOAD_TOKEN` (random 32+ character token also saved in WechatExplorer's secure settings)
+
+Create the private bucket, set secrets, and deploy:
+
+```bash
+npx wrangler r2 bucket create wechatexplorer-share-reports
+npx wrangler secret put WECHAT_APP_ID
+npx wrangler secret put WECHAT_APP_SECRET
+npx wrangler secret put UPLOAD_TOKEN
+npx wrangler deploy
+```
+
+Keep the R2 public development URL disabled. All reads go through the Worker and expire with
+the card.