initial: 七牛云上传 OpenClaw Skill

功能特性:
- 支持 /upload, /u 命令上传文件到七牛云
- 支持 /qiniu-config 配置管理
- 支持飞书卡片交互
- 支持指定上传路径和存储桶
- 自动刷新 CDN 缓存
- 支持文件覆盖上传

包含组件:
- OpenClaw 处理器 (openclaw-processor.js)
- 独立监听器 (scripts/feishu-listener.js)
- 核心上传脚本 (scripts/upload-to-qiniu.js)
- 部署脚本 (deploy.sh)
- 完整文档

部署方式:
1. 复制 skill 到 ~/.openclaw/workspace/skills/
2. 配置 ~/.openclaw/credentials/qiniu-config.json
3. 重启 OpenClaw Gateway

cards/upload-card.json

@@ -0,0 +1,61 @@
+{
+  "config": {
+    "wide_screen_mode": true
+  },
+  "header": {
+    "template": "blue",
+    "title": {
+      "content": "📤 七牛云上传",
+      "tag": "plain_text"
+    }
+  },
+  "elements": [
+    {
+      "tag": "div",
+      "text": {
+        "content": "**当前存储桶：** {{bucket_name}} ({{bucket_id}})\n**区域：** {{region_name}} ({{region_code}})\n**CDN 域名：** {{cdn_domain}}",
+        "tag": "lark_md"
+      }
+    },
+    {
+      "tag": "hr"
+    },
+    {
+      "tag": "action",
+      "actions": [
+        {
+          "tag": "button",
+          "text": {
+            "content": "📎 选择文件上传",
+            "tag": "plain_text"
+          },
+          "type": "primary",
+          "value": {
+            "action": "upload_select",
+            "bucket": "{{bucket_name}}"
+          }
+        },
+        {
+          "tag": "button",
+          "text": {
+            "content": "📋 查看配置",
+            "tag": "plain_text"
+          },
+          "value": {
+            "action": "config_view"
+          }
+        },
+        {
+          "tag": "button",
+          "text": {
+            "content": "❓ 帮助",
+            "tag": "plain_text"
+          },
+          "value": {
+            "action": "help"
+          }
+        }
+      ]
+    }
+  ]
+}