update staff list, add pin editor and privilege editor

lib/pages/staff/model/staff_model.dart

@@ -106,4 +106,29 @@ class StaffModel extends BaseModel {
     }
     return users;
   }
+
+  Future<User?> getUser(String userID) async {
+    if (userID == "") return null;
+
+    String path = "/$user_collection";
+    try {
+      var snap = await FirebaseFirestore.instance
+          .collection(path)
+          .doc(userID)
+          .get(const GetOptions(source: Source.server));
+
+      if (snap.data() == null) return null;
+      Map<String, dynamic>? data = snap.data() as Map<String, dynamic>;
+
+      if (data['delete_time'] == 0) {
+        User user = User.fromMap(data, snap.id);
+        return user;
+      } else {
+        return null;
+      }
+    } catch (e) {
+      log.warning("Error!! $e");
+    }
+    return null;
+  }
 }