feat: migrate ssh menu to Bun/TypeScript

Replace the Bash implementation and jq/yq dependency chain with a Bun-based TypeScript script, add Bun/TypeScript project files, and update docs and sample config notes to match the new CLI and behavior.

package.json

@@ -0,0 +1,13 @@
+{
+  "name": "mtm-ssh-menu",
+  "private": true,
+  "scripts": {
+    "run": "mtm-ssh-menu"
+  },
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  }
+}