fix(mongodb): rename npx variant to com.mongodb-mcp-npx

Align with naming convention used by other servers (e.g., sentry-mcp-npx,
notion-mcp-npx). Renamed file and updated id/name fields.

Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

Author: its-mash

servers/com.mongodb-mcp.json servers/com.mongodb-mcp-npx.jsonservers/com.mongodb-mcp.json renamed to servers/com.mongodb-mcp-npx.json

@@ -1,7 +1,7 @@
 {
   "$schema": "../schemas/server-definition.schema.json",
-  "id": "com.mongodb-mcp",
-  "name": "MongoDB",
+  "id": "com.mongodb-mcp-npx",
+  "name": "MongoDB (npx)",
   "alias": "mongodb",
   "description": "Connect to MongoDB databases and Atlas clusters. Query collections, inspect schemas, manage indexes, and run aggregation pipelines through the official MongoDB MCP server.",
   "icon": "https://avatars.githubusercontent.com/u/11214950?v=4",