feat: add TypeScript support and shared types

- Added TypeScript configuration file (tsconfig.json) with strict settings.
- Introduced devDependencies for TypeScript in package.json.
- Added scripts for type checking and watching for changes.
- Created a new types file (lib/types.ts) defining shared types for the DevClaw plugin.

package.json

@@ -26,7 +26,14 @@
       "./index.ts"
     ]
   },
+  "scripts": {
+    "check": "tsc --noEmit",
+    "watch": "tsc --noEmit --watch"
+  },
   "peerDependencies": {
     "openclaw": ">=2026.0.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.8"
   }
 }