feat: 影像3D重建测试数据和测试脚本

测试数据:
- 10个3D重建任务(CT/MR, 胸部/头部/腹部/膝关节/脊柱/骨盆/心脏)
- 6个重建结果(VR/MPR/MIP三种类型)
- 6个重建报告(DRAFT/REPORTED/VERIFIED三种状态)
- 3位患者关联(刘潇凡/豆包/随子赫)

测试3D影像:
- chest_vr_render.ppm (胸部VR容积渲染)
- head_mpr_axial.ppm (头部MPR轴位)
- abdomen_mip_render.ppm (腹部MIP最大密度投影)
- knee_vr_render.ppm (膝关节VR)
- phantom_volume.raw (16x16x16体数据)
- dicom_metadata.json (DICOM元数据)

测试脚本:
- 3d_reconstruction_test.py (37个测试用例, 97.3%通过率)
- 覆盖: 任务管理/结果管理/报告管理/跨模块联动/数据质量

DB修复:
- reconstruction_task/result/report补全HisBaseEntity列

MD/test/3d_samples/dicom_metadata.json

@@ -0,0 +1,18 @@
+{
+  "PatientName": "刘潇凡",
+  "PatientID": "PN0000000006",
+  "StudyDate": "20260606",
+  "Modality": "CT",
+  "BodyPart": "胸部",
+  "SliceThickness": "1.25mm",
+  "PixelSpacing": "0.625x0.625mm",
+  "ImageSize": "512x512",
+  "NumberOfSlices": "320",
+  "StudyInstanceUID": "1.2.840.113619.2.55.3.12345678",
+  "ReconstructionType": "VR/MPR/MIP",
+  "WindowCenter": "40",
+  "WindowWidth": "400",
+  "BitsAllocated": "16",
+  "BitsStored": "12",
+  "PixelRepresentation": "0"
+}

MD/test/3d_samples/volumes/phantom_volume.raw

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