feat(ios): IOS-M1-07 设置页分组补全

- 新增「关于知习」分组标题

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

AIStudyApp/AIStudyApp/Features/Profile/SettingsView.swift

@@ -99,6 +99,7 @@ struct SettingsView: View {
                         Text("退出后需要重新登录")
                     }
 
+                    sectionHeader("关于知习")
                     HStack(spacing: 4) {
                         Text("知习 v1.0").font(.system(size: 12)).foregroundColor(Color.zxF03)
                     }.padding(.bottom, 100)