chore: update CHANGELOG and version to 0.3.98

- Added feature to filter context before sending to LLM to save tokens.
- Updated version in package.json to reflect the new release.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "9router-app",
-  "version": "0.3.97",
+  "version": "0.3.98",
   "description": "9Router web dashboard",
   "private": true,
   "scripts": {