chore：update mcp icon

app/mcp/mcp_config.json

@@ -1,12 +0,0 @@
-{
-  "mcpServers": {
-    "filesystem": {
-      "command": "npx",
-      "args": [
-        "-y",
-        "@modelcontextprotocol/server-filesystem",
-        "."
-      ]
-    }
-  }
-}