Remove origin bucketing feature

- Remove origin option from client configuration
- Simplify API client to not send Origin header
- Version 0.3.4

Origin-based session isolation has been removed from the server,
so this feature is no longer needed on the client side.

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

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

src/rondevu.ts

@@ -62,7 +62,7 @@ export class Rondevu {
   private async checkServerVersion(): Promise<void> {
     try {
       const { version: serverVersion } = await this.api.health();
-      const clientVersion = '0.3.3'; // Should match package.json
+      const clientVersion = '0.3.4'; // Should match package.json
 
       if (!this.isVersionCompatible(clientVersion, serverVersion)) {
         console.warn(