feat(face): 支持按userFaceId查询单条人脸记录

- FaceDao新增queryByUserFaceId接口，实现按userFaceId精确查询
- FaceApi新增queryByUserFaceId方法，封装Dao查询逻辑
- LoginByFaceActivity插入人脸时，先按userFaceId查询，存在则更新避免重复
- NetViewModelV2同步人脸数据时，优先用userFaceId判重，减少重复入库
- 修正FaceEntity中userId字段数据库列名错误（user_id替代user_idd）
- 增加注释说明及代码格式优化，提升代码可读性和健壮性

app/src/main/java/com/sw/platecabinet/activity/LoginByFaceActivity.kt

@@ -1018,7 +1018,17 @@ class LoginByFaceActivity : BaseActivity<ActivityLoginFaceBinding>(),
             loadLogInfo("collectFace,saveFaceInfo: ----------8,保存人脸取特征数据-----------")
             val faceDao = FaceDatabase.getInstance(this).faceDao()
             val faceEntity = faceModel.toFaceEntity()
-            val faceId = faceDao.insert(faceEntity)
+            // 先查后插：按 userFaceId 判重，避免采集入库与增量同步各插一条
+            val userFaceId = faceModel.userFaceId
+            val existing = if (!userFaceId.isNullOrEmpty()) faceDao.queryByUserFaceId(userFaceId) else null
+            val faceId = if (existing != null) {
+                // 已存在记录，更新特征等字段并复用主键，避免重复
+                faceEntity.faceId = existing.faceId
+                faceDao.updateFaceEntity(faceEntity)
+                existing.faceId
+            } else {
+                faceDao.insert(faceEntity)
+            }
             faceEntity.faceId = faceId
             loadLogInfo("collectFace,saveFaceInfo: ----------10,人脸数据保存完成-----------")
             recognizeViewModel.refreshFaceList()