Strip client to minimal skeleton with ConnectionManager

Removed all complex implementations and kept only the essentials:
- Removed durable/ directory (DurableConnection, DurableChannel, etc.)
- Removed peer/ directory (entire state machine)
- Removed service-pool.ts, offer-pool.ts, rondevu.ts
- Removed auth.ts, offers.ts, usernames.ts, event-emitter.ts
- Added empty ConnectionManager class as starting point

The client now contains just:
- src/connection-manager.ts - Empty class skeleton
- src/index.ts - Simple export

This provides a clean slate to rebuild the client with a simpler
architecture focused on core WebRTC connection management.

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

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

package-lock.json

@@ -10,7 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "@noble/ed25519": "^3.0.0",
-        "@xtr-dev/rondevu-client": "^0.5.1"
+        "@xtr-dev/rondevu-client": "^0.9.2"
       },
       "devDependencies": {
         "typescript": "^5.9.3"
@@ -26,10 +26,13 @@
       }
     },
     "node_modules/@xtr-dev/rondevu-client": {
-      "version": "0.5.1",
-      "resolved": "https://registry.npmjs.org/@xtr-dev/rondevu-client/-/rondevu-client-0.5.1.tgz",
-      "integrity": "sha512-110ejMCizPUPkHwwwNvcdCSZceLaHeFbf1LNkXvbG6pnLBqCf2uoGOOaRkArb7HNNFABFB+HXzm/AVzNdadosw==",
-      "license": "MIT"
+      "version": "0.9.2",
+      "resolved": "https://registry.npmjs.org/@xtr-dev/rondevu-client/-/rondevu-client-0.9.2.tgz",
+      "integrity": "sha512-DVow5AOPU40dqQtlfQK7J2GNX8dz2/4UzltMqublaPZubbkRYgocvp0b76NQu5F6v150IstMV2N49uxAYqogVw==",
+      "license": "MIT",
+      "dependencies": {
+        "@noble/ed25519": "^3.0.0"
+      }
     },
     "node_modules/typescript": {
       "version": "5.9.3",