feat(body_mesh): Add eye mesh edge dissolution data and documentation

- Add edge UV coordinate data for N00_000_00_EyeHighlight_00_EYE mesh component with 264 edges
- Add edge UV coordinate data for N00_000_00_EyeIris_00_EYE mesh component
- Add comprehensive README documentation for body mesh editor resources
- Provide detailed edge dissolution information for eye highlight and iris mesh components to support mesh separation workflow

editor/body_mesh/README.md

@@ -0,0 +1,109 @@
+# Body Mesh UV Edge Selection JSON 文件说明
+
+## 概述
+
+这些JSON文件存储了VRM模型各材质区域需要融并(Dissolve)的边的UV坐标数据。通过UV坐标精确匹配，可以在3D视图中选中对应的边，即使UV存在重叠也不会误选。
+
+## 文件列表
+
+| 文件名 | 描述 |
+|--------|------|
+| `N00_000_00_Body_00_SKIN (Instance).json` | 身体皮肤区域 |
+| `N00_000_00_Face_00_SKIN (Instance).json` | 脸部皮肤区域 |
+| `N00_000_00_FaceMouth_00_FACE (Instance).json` | 口腔区域 |
+| `N00_000_00_FaceEyeline_00_FACE (Instance).json` | 眼线区域 |
+| `N00_000_00_hH_00_FACE (Instance).json` | 面部其他区域 |
+| `N00_000_00_EyeIris_00_EYE (Instance).json` | 瞳孔/虹膜区域 |
+| `N00_000_00_EyeWhite_00_EYE (Instance).json` | 眼白区域 |
+| `N00_000_00_EyeHighlight_00_EYE (Instance).json` | 眼睛高光区域 |
+
+## JSON 结构
+
+```json
+{
+  "description": "区域描述",
+  "total_edges": 边数量,
+  "edge_uvs": [
+    [[u1, v1], [u2, v2]],
+    ...
+  ]
+}
+```
+
+- `description`: 该文件的描述信息
+- `total_edges`: 存储的UV边数量
+- `edge_uvs`: UV边坐标数组，每条边由两个UV坐标点组成
+
+## 使用方法
+
+### 保存当前选中的边到JSON
+
+```python
+import bpy, bmesh, json, os
+
+obj = bpy.context.active_object
+bm = bmesh.from_edit_mesh(obj.data)
+uv_layer = bm.loops.layers.uv.active
+
+selected_uv_edges = []
+seen = set()
+
+for edge in bm.edges:
+    if edge.select:
+        for loop in edge.link_loops:
+            uv1 = (round(loop[uv_layer].uv.x, 6), round(loop[uv_layer].uv.y, 6))
+            uv2 = (round(loop.link_loop_next[uv_layer].uv.x, 6), round(loop.link_loop_next[uv_layer].uv.y, 6))
+            key = (uv1, uv2) if uv1 < uv2 else (uv2, uv1)
+            if key not in seen:
+                seen.add(key)
+                selected_uv_edges.append([list(uv1), list(uv2)])
+
+data = {
+    "description": "描述信息",
+    "total_edges": len(selected_uv_edges),
+    "edge_uvs": selected_uv_edges
+}
+
+with open("output.json", 'w', encoding='utf-8') as f:
+    json.dump(data, f, indent=2, ensure_ascii=False)
+```
+
+### 从JSON加载并选中边
+
+```python
+import bpy, bmesh, json
+
+with open("input.json", 'r', encoding='utf-8') as f:
+    data = json.load(f)
+
+target_uvs = set()
+for edge_uv in data['edge_uvs']:
+    uv1 = (round(edge_uv[0][0], 6), round(edge_uv[0][1], 6))
+    uv2 = (round(edge_uv[1][0], 6), round(edge_uv[1][1], 6))
+    key = (uv1, uv2) if uv1 < uv2 else (uv2, uv1)
+    target_uvs.add(key)
+
+obj = bpy.context.active_object
+bm = bmesh.from_edit_mesh(obj.data)
+uv_layer = bm.loops.layers.uv.active
+
+bpy.ops.mesh.select_all(action='DESELECT')
+bm.select_mode = {'EDGE'}
+
+for edge in bm.edges:
+    for loop in edge.link_loops:
+        uv1 = (round(loop[uv_layer].uv.x, 6), round(loop[uv_layer].uv.y, 6))
+        uv2 = (round(loop.link_loop_next[uv_layer].uv.x, 6), round(loop.link_loop_next[uv_layer].uv.y, 6))
+        key = (uv1, uv2) if uv1 < uv2 else (uv2, uv1)
+        if key in target_uvs:
+            edge.select = True
+            break
+
+bmesh.update_edit_mesh(obj.data)
+```
+
+## 注意事项
+
+1. UV坐标精度为6位小数，匹配时使用相同精度
+2. 即使不同材质区域的UV重叠，通过loop的UV数据独立存储特性，可以精确选中目标边
+3. 这些文件用于在无法使用UV同步选区时，通过UV坐标反向选中3D视图中的边