feat(im): 添加即时通讯功能模块

- 添加了 IM API 接口定义，包含登录、消息、群组、好友等接口
- 实现了 ImSDK 核心功能，支持发送各类消息和管理会话
- 集成了 WebSocket 连接管理和自动重连机制
- 添加了本地联系人缓存并优化对话标题显示逻辑
- 实现了 HarmonyOS 平台 HTTP 客户端基础功能

sample-app/src/main/java/com/xuqm/sdk/sample/ui/conversation/ConversationScreen.kt

@@ -36,6 +36,7 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.viewmodel.compose.viewModel
 import coil3.compose.AsyncImage
 import com.xuqm.sdk.im.model.ConversationData
+import com.xuqm.sdk.sample.di.AppDependencies
 import com.xuqm.sdk.ui.InitialAvatar
 import com.xuqm.sdk.ui.SearchBarField
 import com.xuqm.sdk.utils.TimeFormatters
@@ -201,7 +202,11 @@ private fun conversationTitle(
     return if (conversation.chatType.equals("GROUP", ignoreCase = true)) {
         titles[conversation.targetId].orEmpty().ifBlank { conversation.targetId }
     } else {
-        conversation.targetId
+        AppDependencies.localContactCache.loadProfiles()
+            .firstOrNull { it.userId == conversation.targetId }
+            ?.nickname
+            ?.takeIf { it.isNotBlank() }
+            ?: conversation.targetId
     }
 }
 

sdk-im/src/main/java/com/xuqm/sdk/im/ImSDK.kt

@@ -510,6 +510,18 @@ object ImSDK {
     suspend fun removeFromBlacklist(blockedUserId: String) =
         withContext(Dispatchers.IO) { api.removeFromBlacklist(XuqmSDK.appId, blockedUserId) }
 
+    suspend fun getProfile(userId: String) =
+        withContext(Dispatchers.IO) { api.getProfile(userId, XuqmSDK.appId).data }
+
+    suspend fun updateProfile(
+        userId: String,
+        nickname: String? = null,
+        avatar: String? = null,
+        gender: String? = null,
+    ) = withContext(Dispatchers.IO) {
+        api.updateProfile(userId, XuqmSDK.appId, nickname, avatar, gender).data
+    }
+
     suspend fun listConversations(): List<ConversationData> =
         withContext(Dispatchers.IO) { api.listConversations(XuqmSDK.appId).data ?: emptyList() }
 

sdk-im/src/main/java/com/xuqm/sdk/im/api/ImApi.kt

@@ -6,6 +6,7 @@ import com.xuqm.sdk.im.model.FriendRequest
 import com.xuqm.sdk.im.model.ImGroup
 import com.xuqm.sdk.im.model.GroupJoinRequest
 import com.xuqm.sdk.im.model.ImMessage
+import com.xuqm.sdk.im.model.UserProfile
 import retrofit2.http.Body
 import retrofit2.http.DELETE
 import retrofit2.http.GET
@@ -209,6 +210,21 @@ interface ImApi {
         @Query("blockedUserId") blockedUserId: String,
     ): ApiResponse<Unit>
 
+    @GET("api/im/accounts/{userId}")
+    suspend fun getProfile(
+        @Path("userId") userId: String,
+        @Query("appId") appId: String,
+    ): ApiResponse<UserProfile>
+
+    @PUT("api/im/accounts/{userId}")
+    suspend fun updateProfile(
+        @Path("userId") userId: String,
+        @Query("appId") appId: String,
+        @Query("nickname") nickname: String? = null,
+        @Query("avatar") avatar: String? = null,
+        @Query("gender") gender: String? = null,
+    ): ApiResponse<UserProfile>
+
     @GET("api/im/conversations")
     suspend fun listConversations(@Query("appId") appId: String): ApiResponse<List<ConversationData>>