Move api.settings to common.settings (#11036)

### What problem does this PR solve?

As title

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

agent/tools/code_exec.py

@@ -21,8 +21,8 @@ from strenum import StrEnum
 from typing import Optional
 from pydantic import BaseModel, Field, field_validator
 from agent.tools.base import ToolParamBase, ToolBase, ToolMeta
-from api import settings
 from common.connection_utils import timeout
+from common import settings
 
 
 class Language(StrEnum):