feat: integrate Vitest for testing and update workflows

- Added Vitest as a testing framework in package.json and configured test scripts.
- Created new test files for CLI and client functionalities, ensuring comprehensive coverage.
- Updated GitHub Actions workflows to include testing steps and streamlined release process.
- Removed the deprecated onRelease workflow to consolidate CI/CD processes.

package.json

@@ -25,7 +25,8 @@
     "@biomejs/biome": "2.1.1",
     "@types/node": "^18",
     "tsx": "^4.21.0",
-    "typescript": "^5"
+    "typescript": "^5",
+    "vitest": "^4.1.4"
   },
   "engines": {
     "node": ">=18.0.0"
@@ -48,6 +49,7 @@
     "prebuild": "pnpm run generate",
     "dev": "tsx src/index.ts",
     "lint": "biome check --write .",
+    "test": "vitest run",
     "publish": "npm publish"
   },
   "types": "dist/index.d.ts"