fix(copilot): emit StreamLongRunningStart event in SDK path

Add logic to detect long-running tools in the SDK execution path
and emit StreamLongRunningStart event to trigger UI feedback display.

Changes:
- Import StreamLongRunningStart and get_tool
- Check if tool has is_long_running=True when StreamToolInputAvailable is received
- Yield StreamLongRunningStart event to notify frontend

This ensures the mini-game UI displays for long-running tools
like create_agent when using the SDK execution path.

autogpt_platform/backend/backend/copilot/sdk/service.py

@@ -25,12 +25,14 @@ from ..response_model import (
     StreamFinish,
     StreamFinishStep,
     StreamHeartbeat,
+    StreamLongRunningStart,
     StreamStart,
     StreamTextDelta,
     StreamToolInputAvailable,
     StreamToolOutputAvailable,
 )
 from ..service import _build_system_prompt, _generate_session_title
+from ..tools import get_tool
 from ..tools.sandbox import WORKSPACE_PREFIX, make_session_path
 from ..tracking import track_user_message
 from .response_adapter import SDKResponseAdapter
@@ -731,6 +733,15 @@ async def stream_chat_completion_sdk(
 
                             yield response
 
+                            # Emit long-running notification for tools with is_long_running=True
+                            if isinstance(response, StreamToolInputAvailable):
+                                tool = get_tool(response.toolName)
+                                if tool and tool.is_long_running:
+                                    yield StreamLongRunningStart(
+                                        toolCallId=response.toolCallId,
+                                        toolName=response.toolName,
+                                    )
+
                             if isinstance(response, StreamTextDelta):
                                 delta = response.delta or ""
                                 # After tool results, start a new assistant