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最小原型 · 拖拽房间修正布局，家具/门窗只读预览（复用玄空飞星 SVG 推导）
拖拽房间修正布局（吸附整数网格）· 家具/门窗只读跟随
可拖拽调整房间位置 · 调整结果随当前图会话保留(不持久化到后端) · 能力限于平移(resize / 朝向 / 增删需后续 PR)