fix: lint errors - remove unused import and format files

- Remove unused McpbManifestSchema import from types.ts
- Run prettier on modified files

test/valid-manifest.json

@@ -13,9 +13,7 @@
     "entry_point": "server/index.js",
     "mcp_config": {
       "command": "node",
-      "args": [
-        "${__dirname}/server/index.js"
-      ]
+      "args": ["${__dirname}/server/index.js"]
     }
   }
-}
+}