feat(macos): Add clipboard support to match Linux implementation

macos/main.mm

@@ -27,6 +27,7 @@
 #import "../common/FileManager.h"
 #import "../common/FileTransferV2.h"
 #import "../common/logger.h"
+#import "ClipboardHandler.h"
 
 // Global state
 static std::atomic<bool> g_running(true);
@@ -740,6 +741,22 @@ int DataProcess(void* user, PBYTE szBuffer, ULONG ulLength)
         // C2C 准备接收通知
         FileTransferV2::HandleC2CPrepare(szBuffer, ulLength, nullptr);
         Mprintf("** [%p] C2C Prepare received ***\n", user);
+    } else if (szBuffer[0] == COMMAND_C2C_TEXT) {
+        // C2C 文本剪贴板: [cmd:1][dstClientID:8][textLen:4][text:N]
+        if (ulLength >= 13) {
+            uint32_t textLen;
+            memcpy(&textLen, szBuffer + 9, 4);
+            if (ulLength >= 13 + textLen && textLen > 0) {
+                if (!ClipboardHandler::IsAvailable()) {
+                    Mprintf("** [%p] C2C Text: clipboard unavailable ***\n", user);
+                } else {
+                    std::string utf8Text((const char*)szBuffer + 13, textLen);
+                    if (ClipboardHandler::SetText(utf8Text)) {
+                        Mprintf("** [%p] C2C Text received: %u bytes ***\n", user, textLen);
+                    }
+                }
+            }
+        }
     } else if (szBuffer[0] == COMMAND_SEND_FILE_V2 || szBuffer[0] == COMMAND_FILE_COMPLETE_V2) {
         // V2 文件接收
         int result = FileTransferV2::RecvFileChunkV2(szBuffer, ulLength, g_myClientID);