Reset ViewModels on logout/account switch

This commit introduces a `ResetModel()` function to `AgentViewModel` and `MineAgentViewModel` to clear their state.

This function is now called in `ResourceCleanupManager` and `AppState` during logout or when switching accounts to ensure that data from the previous session is not retained.

Additionally, the search and group name input fields in `CreateGroupChatScreen` are now single-line.

app/src/main/java/com/aiosman/ravenow/utils/ResourceCleanupManager.kt

@@ -63,7 +63,7 @@ object ResourceCleanupManager {
         IndexViewModel.ResetModel()
         
         // 重置AI相关ViewModel
-        // AgentViewModel的属性是私有的，无法直接访问，通过其他方式清理
+        AgentViewModel.ResetModel()
         
         HotAgentViewModel.let {
             it.agentList = emptyList()
@@ -75,13 +75,7 @@ object ResourceCleanupManager {
             it.clearPreloadedImages()
         }
         
-        MineAgentViewModel.let {
-            it.refreshing = false
-            it.isLoading = false
-            it.hasNext = true
-            it.currentPage = 1
-            it.error = null
-        }
+        MineAgentViewModel.ResetModel()
         
         // 重置动态相关ViewModel
         TimelineMomentViewModel.ResetModel()
@@ -220,7 +214,7 @@ object ResourceCleanupManager {
     fun cleanupPageResources(pageType: String) {
         when (pageType) {
             "ai" -> {
-                // AgentViewModel的属性是私有的，无法直接访问
+                AgentViewModel.ResetModel()
                 HotAgentViewModel.let {
                     it.agentList = emptyList()
                     it.refreshing = false
@@ -230,13 +224,7 @@ object ResourceCleanupManager {
                     it.error = null
                     it.clearPreloadedImages()
                 }
-                MineAgentViewModel.let {
-                    it.refreshing = false
-                    it.isLoading = false
-                    it.hasNext = true
-                    it.currentPage = 1
-                    it.error = null
-                }
+                MineAgentViewModel.ResetModel()
             }
             "moment" -> {
                 TimelineMomentViewModel.ResetModel()