首个可运行的版本

backend/app/schemas/conversation.py

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+"""会话相关 Schema"""
+
+from datetime import datetime
+
+from pydantic import BaseModel, Field
+
+
+class ConversationCreate(BaseModel):
+    type: str = Field(..., pattern="^(private|group)$")
+    name: str | None = Field(None, max_length=100)
+    member_ids: list[str] = Field(..., min_length=1)
+
+
+class ConversationRead(BaseModel):
+    id: str
+    type: str
+    name: str | None = None
+    avatar_url: str | None = None
+    description: str | None = None
+    last_message_preview: str | None = None
+    last_message_at: datetime | None = None
+    created_at: datetime
+    unread_count: int = 0
+
+    model_config = {"from_attributes": True}
+
+
+class ConversationDetail(ConversationRead):
+    members: list["MemberRead"] = []
+
+
+class MemberRead(BaseModel):
+    id: str
+    user_id: str
+    username: str
+    nickname: str | None = None
+    avatar_url: str | None = None
+    role: str = "member"
+    joined_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class ConversationUpdate(BaseModel):
+    name: str | None = Field(None, max_length=100)
+    description: str | None = Field(None, max_length=500)
+    avatar_url: str | None = None
+
+
+class GroupCreate(BaseModel):
+    name: str = Field(..., min_length=1, max_length=100)
+    description: str | None = Field(None, max_length=500)
+    member_ids: list[str] = Field(..., min_length=1)