feat(ios): 复习提醒开关切换铃铛图标（开=响铃/关=静音）

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

AIStudyApp/AIStudyApp/Assets.xcassets/Icons/icon-bell-off.imageset/Contents.json

@@ -0,0 +1 @@
+{"images":[{"filename":"icon-bell-off.svg","idiom":"universal"}],"info":{"author":"xcode","version":1},"properties":{"template-rendering-intent":"template","preserves-vector-representation":true}}

AIStudyApp/AIStudyApp/Assets.xcassets/Icons/icon-bell-off.imageset/icon-bell-off.svg

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AIStudyApp/AIStudyApp/Assets.xcassets/Icons/icon-bell-on.imageset/Contents.json

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+{"images":[{"filename":"icon-bell-on.svg","idiom":"universal"}],"info":{"author":"xcode","version":1},"properties":{"template-rendering-intent":"template","preserves-vector-representation":true}}

AIStudyApp/AIStudyApp/Assets.xcassets/Icons/icon-bell-on.imageset/icon-bell-on.svg

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AIStudyApp/AIStudyApp/Features/Profile/SettingsView.swift

@@ -45,7 +45,7 @@ struct SettingsView: View {
 
                     sectionHeader("复习提醒")
                     VStack(spacing: 0) {
-                        ZXSettingToggleRow(title: "开启复习提醒", icon: "bell.badge.fill", color: Color.zxF05, isOn: $reviewReminder)
+                        ZXSettingToggleRow(title: "开启复习提醒", icon: reviewReminder ? "icon-bell-on" : "icon-bell-off", color: Color.zxF05, isOn: $reviewReminder, isCustom: true)
                         if reviewReminder {
                             ZXSettingDivider()
                             ZXSettingPickerRow(title: "提醒时间", value: $reminderTime, options: ["08:00", "12:00", "18:00", "20:00", "21:00"])