[整理] .gitignore 補上 SDK/CSharp bin/obj 和 *.tgz

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Reymer

.gitignore

@@ -3,8 +3,13 @@ Server/bin/
 Server/obj/
 Server.Tests/bin/
 Server.Tests/obj/
+SDK/CSharp/**/bin/
+SDK/CSharp/**/obj/
 SDK/Unity/EdgeLinkSDK/
 SDK/Unity/dist/
+
+# UPM tarball
+*.tgz
 IOT-Server/DeviceSimulator/bin/
 IOT-Server/DeviceSimulator/obj/
 IOT-Server/EdgeLinkSdk/bin/