Switch Context7 MCP to remote HTTP server

external_plugins/context7/.mcp.json

@@ -1,6 +1,6 @@
 {
   "context7": {
-    "command": "npx",
-    "args": ["-y", "@upstash/context7-mcp"]
+    "type": "http",
+    "url": "https://mcp.context7.com/mcp"
   }
 }