chore: update version numbers in package.json and Cargo.toml to 1.6.0

- Bump version in package.json and Cargo.toml to reflect the new release version.

Author: milisp

tauri-app/package.json

@@ -8,7 +8,7 @@
   "author": "milisp",
   "license": "MIT",
   "private": true,
-  "version": "1.5.4",
+  "version": "1.6.0",
   "type": "module",
   "scripts": {
     "dev": "vite",

tauri-app/src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mcp-linker"
-version = "1.5.4"
+version = "1.6.0"
 description = "Easily connect and manage MCP servers for Claude and other clients"
 authors = ["milisp"]
 edition = "2021"