feat: 升级算法包 delivery_v1.1 → v1.2，新增任务级 CAD 与测距面板

- 算法包替换为 delivery_v1.2（coupler_panel 新增 autotune/layer_select，underframe_deflection 新增 single_beam 管线），删除 delivery_v1.1
- manifests/adapters 的 PYTHONPATH 与版本说明同步更新到 v1.2
- 新增任务级 CAD 文件支持（task_cad_files 表、上传/读取路由、TaskManager 全选与加载显示）
- 新增 train-measurement 自定义前端面板（YAML 编辑器 + 可视化 ROI 配置 + 3D 取点）
- PointCloudViewer 支持 PLY 叠加层渲染与 ROI 拾取
- Dockerfile 改用 Miniforge 安装 pythonocc-core，修复 libgomp/libstdc++ 依赖

alg/delivery_v1.2/underframe_deflection/exceptions.py

@@ -0,0 +1,40 @@
+"""Public exception hierarchy for underframe_deflection.
+
+Integrators should catch `DeflectionError` for any algorithm failure that
+should be surfaced to the user. Subclasses indicate what specifically went
+wrong so callers can render targeted error messages.
+
+Non-fatal data-quality issues are not raised as exceptions; they are
+reported via `DeflectionResult.quality_flags`.
+"""
+
+from __future__ import annotations
+
+
+class DeflectionError(Exception):
+    """Base class for all errors raised by the deflection pipeline."""
+
+
+class InvalidPointCloudError(DeflectionError):
+    """Raised when the input point cloud is malformed or unreadable."""
+
+
+class InsufficientPointsError(DeflectionError):
+    """Raised when the input has too few points to run the pipeline."""
+
+
+class FrameInferenceError(DeflectionError):
+    """Raised when the vehicle reference frame cannot be determined."""
+
+
+class UnsupportedFormatError(InvalidPointCloudError):
+    """Raised when the input file extension is not supported."""
+
+
+__all__ = [
+    "DeflectionError",
+    "InvalidPointCloudError",
+    "InsufficientPointsError",
+    "FrameInferenceError",
+    "UnsupportedFormatError",
+]