Replace origin override with global option

- Remove origin parameter from connect() method
- Add ConnectOptions interface with global flag
- When global: true, sends X-Rondevu-Global header instead of trying to override Origin
- Update client methods to accept customHeaders parameter
- Pass custom headers through connection polling and ICE candidate exchange
- Bump version to 0.1.0

This change works around browser restriction on Origin header modification.

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

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

src/types.ts

@@ -191,6 +191,14 @@ export interface RondevuOptions {
   connectionTimeout?: number;
 }
 
+/**
+ * Options for connecting to a session
+ */
+export interface ConnectOptions {
+  /** Use global origin (https://ronde.vu) instead of request origin for session isolation */
+  global?: boolean;
+}
+
 /**
  * Options for joining a topic
  */