fix(qbzd): QConnect form-encoded createToken + mDNS hostname + response parsing

3 fixes:
1. qws/createToken needs form body (jwt=jwt_qws, user_auth_token_needed,
   strong_auth_needed) not empty body. Was getting 400 Bad Request.
2. mDNS hostname must end with '.local.' for service registration.
3. Response parsing: jwt_qws.endpoint + jwt_qws.jwt, not tokens array.

All 3 patterns copied from working desktop implementation in
qconnect_service.rs.

cc

crates/qbzd/src/daemon.rs

@@ -265,7 +265,7 @@ fn register_mdns(config: &DaemonConfig) -> Result<mdns_sd::ServiceDaemon, String
     let service_info = mdns_sd::ServiceInfo::new(
         "_qbz._tcp.local.",
         &service_name,
-        &format!("{}.", hostname::get().ok().and_then(|h| h.into_string().ok()).unwrap_or_else(|| "localhost".to_string())),
+        &format!("{}.local.", hostname::get().ok().and_then(|h| h.into_string().ok()).unwrap_or_else(|| "localhost".to_string())),
         "",
         config.server.port,
         None,