添加nova chat 接口

app/schemas/nova_chat.py

@@ -0,0 +1,27 @@
+"""Nova Chat Schema
+
+请求参数 Param、响应 Dto。
+字段命名使用 camelCase alias，与前端 JSON 对齐。
+"""
+
+from typing import Literal, Optional
+
+from pydantic import BaseModel, Field
+
+ChatRole = Literal["user", "assistant"]
+
+
+class ChatMessage(BaseModel):
+    role: ChatRole
+    content: str
+
+
+class NovaChatParam(BaseModel):
+    message: str = Field(..., description="用户输入的消息")
+    resume_id: int = Field(..., alias="resumeId", description="简历ID")
+    job_id: Optional[int] = Field(default=None, alias="jobId", description="当前浏览岗位ID，不传则无岗位上下文")
+    history: list[ChatMessage] = Field(default_factory=list, description="历史对话，前端维护")
+
+
+class NovaChatDto(BaseModel):
+    message: str = Field(..., description="AI回复，Markdown格式")