feat: implement basic server logic

src/server/chat_request.py

@@ -0,0 +1,37 @@
+from typing import List, Optional, Union
+
+from pydantic import BaseModel, Field
+
+
+class ContentItem(BaseModel):
+    type: str = Field(..., description="The type of content (text, image, etc.)")
+    text: Optional[str] = Field(None, description="The text content if type is 'text'")
+    image_url: Optional[str] = Field(
+        None, description="The image URL if type is 'image'"
+    )
+
+
+class ChatMessage(BaseModel):
+    role: str = Field(
+        ..., description="The role of the message sender (user or assistant)"
+    )
+    content: Union[str, List[ContentItem]] = Field(
+        ...,
+        description="The content of the message, either a string or a list of content items",
+    )
+
+
+class ChatRequest(BaseModel):
+    messages: List[ChatMessage] = Field(
+        ..., description="History of messages between the user and the assistant"
+    )
+    debug: Optional[bool] = Field(False, description="Whether to enable debug logging")
+    thread_id: Optional[str] = Field(
+        "__default__", description="A specific conversation identifier"
+    )
+    max_plan_iterations: Optional[int] = Field(
+        1, description="The maximum number of plan iterations"
+    )
+    max_step_num: Optional[int] = Field(
+        3, description="The maximum number of steps in a plan"
+    )