Add partition configuration for double-shutter wardrobes with both-side filler

Add a partition configuration from partition level under construction for a double-shutter wardrobe, choosing from default configurations such as left-side, right-side and both-side filler.

1. For a double-shutter wardrobe, add a partition configuration from partition level under construction.

   ✓ 已于 2026年10月11日 在产品中核实

2. Default configurations are available, including left-side filler, right-side filler and both-side filler.

   ✓ 已于 2026年10月11日 在产品中核实