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/main.py

@@ -109,6 +109,59 @@ def _seed_default_project_sync() -> None:
         db.close()
 
 
+def _seed_default_templates_sync() -> None:
+    """Seed default ontology templates on first startup."""
+    from models import Template
+
+    db = SessionLocal()
+    try:
+        if db.query(Template).first() is not None:
+            return
+
+        # Laparoscopic cholecystectomy template (35 classes)
+        colors = [
+            (134, 124, 118), (0, 157, 142), (245, 161, 0), (255, 172, 159), (146, 175, 236), (155, 62, 0),
+            (255, 91, 0), (255, 234, 0), (85, 111, 181), (155, 132, 0), (181, 227, 14), (72, 0, 255),
+            (255, 0, 255), (29, 32, 136), (240, 16, 116), (160, 15, 95), (0, 155, 33), (0, 160, 233),
+            (52, 184, 178), (66, 115, 82), (90, 120, 41), (255, 0, 0), (117, 0, 0), (167, 24, 233),
+            (42, 8, 66), (112, 113, 150), (0, 255, 0), (255, 255, 255), (0, 255, 255), (181, 85, 105),
+            (113, 102, 140), (202, 202, 200), (197, 83, 181), (136, 162, 196), (138, 251, 213),
+        ]
+        names = [
+            '针', '线', '肿瘤', '血管阻断夹', '棉球', '双极电凝',
+            '肝脏', '胆囊', '分离钳', '脂肪', '止血海绵', '肝总管',
+            '吸引器', '剪刀', '超声刀', '止血纱布', '胆总管', '生物夹',
+            '无损伤钳', '钳夹', '喷洒', '胆囊管', '动脉', '电凝',
+            '静脉', '标本袋', '引流管', '纱布', '金属钛夹', '韧带',
+            '肝蒂', '推结器', '乳胶管-血管阻断', '吻合器', '术中超声',
+        ]
+        classes = []
+        for idx, (rgb, name) in enumerate(zip(colors, names)):
+            color_hex = f"#{rgb[0]:02x}{rgb[1]:02x}{rgb[2]:02x}"
+            classes.append({
+                "id": f"cls-lap-{idx}",
+                "name": name,
+                "color": color_hex,
+                "zIndex": (len(names) - idx) * 10,
+                "category": "腹腔镜胆囊切除术",
+            })
+
+        template = Template(
+            name="腹腔镜胆囊切除术",
+            description="腹腔镜胆囊切除术（LC）手术器械与解剖结构语义分割模板，共35个分类",
+            color="#06b6d4",
+            z_index=0,
+            mapping_rules={"classes": classes, "rules": []},
+        )
+        db.add(template)
+        db.commit()
+        logger.info("Seeded default template '腹腔镜胆囊切除术' with %d classes", len(classes))
+    except Exception as exc:
+        logger.error("Failed to seed default templates: %s", exc)
+    finally:
+        db.close()
+
+
 @asynccontextmanager
 async def lifespan(app: FastAPI):
     """Application lifespan: startup and shutdown hooks."""
@@ -134,6 +187,12 @@ async def lifespan(app: FastAPI):
     else:
         logger.warning("Redis connection failed.")
 
+    # Seed default templates
+    try:
+        asyncio.create_task(asyncio.to_thread(_seed_default_templates_sync))
+    except Exception as exc:  # noqa: BLE001
+        logger.error("Failed to start default template seeding: %s", exc)
+
     # Seed default project in background thread so it doesn't block startup
     try:
         asyncio.create_task(asyncio.to_thread(_seed_default_project_sync))