fix(template): 修复模板库保存/颜色/拖拽排序，联动OntologyInspector，种子腹腔镜35分类模板

- backend/schemas.py: TemplateUpdate 添加 classes/rules 字段
- backend/models.py: Template 添加 description 列
- backend/routers/templates.py: create/update 打包/解包 mapping_rules.classes (已有)
- backend/main.py: seed 腹腔镜胆囊切除术35分类模板
- src/lib/api.ts: updateTemplate 改 PATCH，补齐 color/z_index，_mapTemplate 对齐 TS 接口
- src/store/useStore.ts: 新增 activeTemplateId/setActiveTemplateId
- src/components/TemplateRegistry.tsx: 随机颜色(HSL轮盘)、HTML5拖拽排序、批量JSON导入、一键载入腹腔镜模板、handleSave 补齐必填字段
- src/components/OntologyInspector.tsx: 完全重写，从store读取模板，支持模板切换和自定义分类
- src/components/VideoWorkspace.tsx: 进入时自动加载模板列表
- src/components/ProjectLibrary.tsx: 修复状态字符串 TS 严格类型报错
- 工程分析/: 更新实现方案与经验记录

Timestamp: 20260430_222830

backend/schemas.py

@@ -73,6 +73,8 @@ class TemplateBase(BaseModel):
     color: str
     z_index: int = 0
     mapping_rules: Optional[dict[str, Any]] = None
+    classes: Optional[list[dict[str, Any]]] = None
+    rules: Optional[list[dict[str, Any]]] = None
 
 
 class TemplateCreate(TemplateBase):
@@ -84,6 +86,8 @@ class TemplateUpdate(BaseModel):
     color: Optional[str] = None
     z_index: Optional[int] = None
     mapping_rules: Optional[dict[str, Any]] = None
+    classes: Optional[list[dict[str, Any]]] = None
+    rules: Optional[list[dict[str, Any]]] = None
 
 
 class TemplateOut(TemplateBase):