feat: 添加 Agent 步骤事件与图片附件功能

- 新增 stepStarted/stepFinished 事件类型支持
- 前端实现图片附件上传和预览功能
- 后端增强工具结果存储和事件处理
- 完善相关单元测试和集成测试

backend/src/core/agentscope/runtime/tasks.py

@@ -21,6 +21,7 @@ from core.config.settings import config
 from core.db.session import AsyncSessionLocal
 from core.logging import get_logger
 from core.taskiq.app import bulk_broker, critical_broker, default_broker
+from core.agentscope.tools.tool_result_storage import create_tool_result_storage
 from models.agent_chat_message import AgentChatMessage, AgentChatMessageRole
 from services.base.redis import get_or_init_redis_client
 
@@ -67,16 +68,10 @@ def _build_user_context(*, owner_id: UUID, run_input: RunCommand) -> UserAgentCo
 def _extract_user_token(
     *, command: dict[str, Any], run_input: RunCommand
 ) -> str | None:
+    del run_input
     raw_token = command.get("user_token")
     if isinstance(raw_token, str) and raw_token.strip():
         return raw_token.strip()
-    forwarded = (
-        run_input.forwarded_props if isinstance(run_input.forwarded_props, dict) else {}
-    )
-    for key in ("accessToken", "userToken", "token"):
-        value = forwarded.get(key)
-        if isinstance(value, str) and value.strip():
-            return value.strip()
     return None
 
 
@@ -162,7 +157,11 @@ async def run_agentscope_task(command: dict[str, Any]) -> dict[str, object]:
     )
     pipeline = AgentScopeEventPipeline(
         codec=AgentScopeAgUiCodec(),
-        store=SqlAlchemyEventStore(session_factory=AsyncSessionLocal),
+        store=SqlAlchemyEventStore(
+            session_factory=AsyncSessionLocal,
+            tool_result_storage=create_tool_result_storage(),
+            tool_result_bucket=config.storage.bucket,
+        ),
         bus=bus,
     )
     runtime = route_runtime_type(