chore: add MCP Registry server.json and gitignore updates

Add server.json for Official MCP Registry publishing (com.mcpmux/mcp-mux).
Update .gitignore to exclude registry token files and mcp-publisher binary.

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

Author: its-mash

.gitignore

@@ -17,6 +17,11 @@ out/
 *.pfx
 credentials.json
 secrets.json
+.mcpregistry_*
+
+# MCP Registry publisher
+mcp-publisher.exe
+mcp-publisher_*.tar.gz
 
 # IDE
 .idea/

server.json

@@ -0,0 +1,12 @@
+{
+  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
+  "name": "com.mcpmux/mcp-mux",
+  "title": "McpMux",
+  "description": "McpMux — configure MCP servers once, connect every AI client through one local gateway.",
+  "websiteUrl": "https://mcpmux.com",
+  "repository": {
+    "url": "https://github.com/mcpmux/mcp-mux",
+    "source": "github"
+  },
+  "version": "0.1.1"
+}