fix: 同步 skill.json 版本至 2.1.0，移除 fetch_api 依赖

- 4 个全局技能 skill.json version/latestVersion 统一为 2.1.0
- requires.tools 移除已废弃的 fetch_api
- 更新 updatedAt 和 changelog

skills/update-agent/skill.json

@@ -12,9 +12,9 @@
     "配置管理",
     "版本控制"
   ],
-  "version": "1.1.0",
-  "latestVersion": "1.1.0",
-  "updatedAt": "2026-02-17",
+  "version": "2.1.0",
+  "latestVersion": "2.1.0",
+  "updatedAt": "2026-02-26",
   "maintainer": {
     "name": "DesireCore Official",
     "verified": true
@@ -25,11 +25,9 @@
   "installStatus": "not_installed",
   "riskLevel": "high",
   "requires": {
-    "tools": [
-      "fetch_api"
-    ],
+    "tools": [],
     "connections": []
   },
   "compatibleAgents": [],
-  "changelog": "v1.1.0: 新增受保护路径检查与共享配置引用"
+  "changelog": "v2.1.0: 移除 fetch_api 依赖，改为通过 Bash/curl 调用 HTTP API；API 地址由 system prompt 注入；新增 PUT /api/agents/:id/files/* 端点说明"
 }