fix: update TypeScript config for proper openclaw plugin-sdk type resolution

Changed module resolution from Node16 to Bundler (with ESNext module) to
properly resolve openclaw/plugin-sdk type exports. This fixes build errors
where OpenClawPluginApi and jsonResult types were not being found.

The Node16 module resolution was not following the re-exports in openclaw's
plugin-sdk index.d.ts correctly. Bundler resolution is more compatible with
modern package.json exports.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tsconfig.json

@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
     "target": "ES2022",
-    "module": "Node16",
-    "moduleResolution": "Node16",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
     "outDir": "./dist",
     "rootDir": ".",
     "declaration": true,