docs(dropdown-menu): 补齐官方示例矩阵 - #1034
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🤔 这个 PR 的性质是？
🔗 相关 Issue
💡 需求背景和解决方案
DropdownMenu 的锚点、滚动跟随与自动方向能力已完整，但示例页未公开展示官方 1/2/3 列多选、纯禁用菜单、向上展开与自定义开合图标场景，示例分组也较零散。本次仅改动 Example 层：
01 组件类型/02 组件状态/03 Flutter 额外能力三组，按场景归类。columns: 1/2/3，面板maxHeight: 280）。enabled: false）。placement: TDropdownMenuPlacement.above与TDropdownMenuItem.custom）。实现复用现有公开 API，未改动组件源码与公开 API，无 breaking change。对应 Spec：
specs/011-dropdown-menu-official-demos/。验证与待办（如实说明）：Flutter 3.32.0 聚焦测试与分析通过、组件生产源码 LCOV ≥95%、生成片段与源码同步；Flutter latest 聚焦测试与分析通过，但既有组件用例存在一处非本次改动的 0.93px 几何断言差异（原容差 0.5px）尚未处理。真机/像素与官方截图对照、新 Demo 的 Golden 快照，以及勾选默认位置/空选行为/全局最大高度等公开契约的维护者决策，均仍待完成。
📝 更新日志
docs(dropdown-menu): 示例新增 1/2/3 列多选、禁用与向上展开自定义图标场景，并重组示例分组
本条 PR 不需要纳入 Changelog
☑️ 请求合并前的自查清单
type(<scope>?): 修改描述。示例：
fix(TBottomTabBar): 修复 iconText 模式底部溢出