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/routers/templates.py

@@ -14,6 +14,26 @@ logger = logging.getLogger(__name__)
 router = APIRouter(prefix="/api/templates", tags=["Templates"])
 
 
+def _pack_mapping_rules(data: dict) -> dict:
+    """Pack classes/rules into mapping_rules for DB storage."""
+    mapping = data.get("mapping_rules") or {}
+    if "classes" in data and data["classes"] is not None:
+        mapping["classes"] = data["classes"]
+    if "rules" in data and data["rules"] is not None:
+        mapping["rules"] = data["rules"]
+    data["mapping_rules"] = mapping
+    return data
+
+
+def _unpack_template(template: Template) -> Template:
+    """Unpack mapping_rules into classes/rules for response."""
+    mapping = template.mapping_rules or {}
+    # Set as attributes so Pydantic from_attributes can pick them up
+    template.classes = mapping.get("classes", [])
+    template.rules = mapping.get("rules", [])
+    return template
+
+
 @router.post(
     "",
     response_model=TemplateOut,
@@ -22,10 +42,13 @@ router = APIRouter(prefix="/api/templates", tags=["Templates"])
 )
 def create_template(payload: TemplateCreate, db: Session = Depends(get_db)) -> Template:
     """Create a new ontology template / segmentation class."""
-    template = Template(**payload.model_dump())
+    data = payload.model_dump()
+    data = _pack_mapping_rules(data)
+    template = Template(**data)
     db.add(template)
     db.commit()
     db.refresh(template)
+    _unpack_template(template)
     logger.info("Created template id=%s name=%s", template.id, template.name)
     return template
 
@@ -41,7 +64,10 @@ def list_templates(
     db: Session = Depends(get_db),
 ) -> List[Template]:
     """Retrieve all ontology templates."""
-    return db.query(Template).offset(skip).limit(limit).all()
+    templates = db.query(Template).offset(skip).limit(limit).all()
+    for t in templates:
+        _unpack_template(t)
+    return templates
 
 
 @router.get(
@@ -54,6 +80,7 @@ def get_template(template_id: int, db: Session = Depends(get_db)) -> Template:
     template = db.query(Template).filter(Template.id == template_id).first()
     if not template:
         raise HTTPException(status_code=404, detail="Template not found")
+    _unpack_template(template)
     return template
 
 
@@ -72,11 +99,16 @@ def update_template(
     if not template:
         raise HTTPException(status_code=404, detail="Template not found")
 
-    for key, value in payload.model_dump(exclude_unset=True).items():
+    data = payload.model_dump(exclude_unset=True)
+    if "classes" in data or "rules" in data:
+        data = _pack_mapping_rules(data)
+
+    for key, value in data.items():
         setattr(template, key, value)
 
     db.commit()
     db.refresh(template)
+    _unpack_template(template)
     logger.info("Updated template id=%s", template_id)
     return template