feat: 真实3D影像重建查看器 - 基于Canvas体绘制渲染

3D查看器(viewer.vue):
- VR容积渲染: 光线投射算法,5种医学预设(骨骼/软组织/肺部/血管/皮肤)
- MPR多平面重建: 轴位/矢状位/冠状位三平面联动,鼠标滚轮切换层面
- MIP最大密度投影: 最大密度投射算法
- 2D切片浏览: DICOM窗宽窗位调节
- 交互工具: 旋转/缩放/平移/测量/窗宽窗位
- 信息叠加: 患者信息/检查参数/窗宽窗位/层厚像素

体数据:
- 64x64x64合成胸部CT体数据(含肺/心脏/脊柱/肋骨/软组织)
- HU值模拟真实CT(-1000~+1000)
- 5种Transfer Function(骨骼/软组织/肺部/血管/皮肤)

依赖: cornerstone-core/dicom-parser/@kitware/vtk.js

MD/test/3d_samples/dicom_metadata.json

@@ -1,18 +1,91 @@
 {
-  "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"
+  "patientInfo": {
+    "patientName": "刘潇凡",
+    "patientID": "PN0000000006",
+    "birthDate": "2007-04-29",
+    "sex": "M",
+    "age": "19Y"
+  },
+  "studyInfo": {
+    "studyDate": "2026-06-06",
+    "studyTime": "14:30:22",
+    "studyDescription": "胸部CT平扫+三维重建",
+    "studyInstanceUID": "1.2.840.113619.2.55.3.12345678",
+    "accessionNumber": "CT20260606001"
+  },
+  "seriesInfo": {
+    "modality": "CT",
+    "bodyPartExamined": "CHEST",
+    "institutionName": "广西医科大学第一附属医院",
+    "stationName": "CT-SOMATOM_FORCE",
+    "manufacturer": "SIEMENS",
+    "model": "SOMATOM Force",
+    "softwareVersion": "syngo CT VA48A"
+  },
+  "imageParams": {
+    "rows": 512,
+    "columns": 512,
+    "sliceThickness": 1.25,
+    "pixelSpacing": [
+      0.625,
+      0.625
+    ],
+    "kvp": 120,
+    "mas": 200,
+    "rotationTime": 0.5,
+    "pitch": 0.9,
+    "reconstructionKernel": "B31f",
+    "windowCenter": 40,
+    "windowWidth": 400,
+    "rescaleIntercept": -1024,
+    "rescaleSlope": 1,
+    "bitsAllocated": 16,
+    "bitsStored": 12,
+    "numberOfImages": 320,
+    "imageType": [
+      "DERIVED",
+      "SECONDARY",
+      "MPR"
+    ]
+  },
+  "reconstructionParams": {
+    "algorithm": "Feldkamp-Davis-Kress (FDK)",
+    "reconType": [
+      "VR",
+      "MPR",
+      "MIP"
+    ],
+    "sliceRange": "5.0mm - 350.0mm",
+    "fieldOfView": 350,
+    "matrixSize": [
+      512,
+      512
+    ],
+    "voxelSize": [
+      0.684,
+      0.684,
+      1.25
+    ]
+  },
+  "clinicalFindings": {
+    "lungVolumes": {
+      "left": "1650ml",
+      "right": "1820ml",
+      "total": "3470ml"
+    },
+    "heartVolume": "485ml",
+    "mediastinalStructures": "正常",
+    "pleuralSpace": "未见积液",
+    "lesions": [
+      {
+        "location": "右肺上叶(S1)",
+        "size": "8.5mm x 7.2mm",
+        "density": "实性",
+        "shape": "类圆形",
+        "margin": "光滑",
+        "bradsCategory": "3类",
+        "recommendation": "3个月后复查"
+      }
+    ]
+  }
 }