fix(mcp): drop unreachable throw in setTimeout-wrapped initial sync (zilliztech#318)

Remove throw in setTimeout callback that would crash the MCP server process on unexpected background sync errors. The error is already logged via console.error, and the periodic sync will retry on the next cycle.

Author: mvanhorn

packages/mcp/src/sync.ts

@@ -126,7 +126,7 @@ export class SyncManager {
                     console.log('[SYNC-DEBUG] Collection not yet established, this is expected for new cluster users. Will retry on next sync cycle.');
                 } else {
                     console.error('[SYNC-DEBUG] Initial sync failed with unexpected error:', error);
-                    throw error;
+                    // Do not re-throw here: this callback runs via setTimeout with no caller to propagate to.
                 }
             }
         }, 5000); // Initial sync after 5 seconds