feat: lite deep researcher implementation

src/config/agents.py

@@ -0,0 +1,13 @@
+from typing import Literal
+
+# Define available LLM types
+LLMType = Literal["basic", "reasoning", "vision"]
+
+# Define agent-LLM mapping
+AGENT_LLM_MAP: dict[str, LLMType] = {
+    "coordinator": "basic",  # 协调默认使用basic llm
+    "planner": "basic",  # 计划默认使用basic llm
+    "researcher": "basic",  # 简单搜索任务使用basic llm
+    "coder": "basic",  # 编程任务使用basic llm
+    "reporter": "basic",  # 报告使用basic llm
+}