v2.1.0: Rewrite to use simplified Rondevu API

- Complete rewrite to use low-level Rondevu API directly
- Removed ServiceHost/ServiceClient abstractions
- Manual RTCPeerConnection and data channel setup
- Custom polling for answers and ICE candidates
- Updated to use new Rondevu class instead of RondevuService
- Direct signaling method calls instead of getAPI()
- Reduced from 926 lines to 542 lines (42% reduction)
- Demonstrates complete WebRTC flow with clear offerer/answerer roles

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "rondevu-demo",
-  "version": "2.0.0",
+  "version": "0.12.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "rondevu-demo",
-      "version": "2.0.0",
+      "version": "0.12.2",
       "dependencies": {
         "@xtr-dev/rondevu-client": "^0.12.0",
         "@zxing/library": "^0.21.3",