首个可运行的版本

backend/app/schemas/user.py

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+"""用户相关 Schema"""
+
+from datetime import datetime
+
+from pydantic import BaseModel, Field
+
+
+class UserRead(BaseModel):
+    id: str
+    username: str
+    email: str
+    avatar_url: str | None = None
+    bio: str | None = None
+    status: str = "offline"
+    created_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class UserProfile(BaseModel):
+    """他人可见的公开信息"""
+    id: str
+    username: str
+    avatar_url: str | None = None
+    bio: str | None = None
+    status: str = "offline"
+
+    model_config = {"from_attributes": True}
+
+
+class UserUpdate(BaseModel):
+    username: str | None = Field(None, min_length=2, max_length=50)
+    bio: str | None = Field(None, max_length=200)
+    avatar_url: str | None = None
+
+
+class PasswordChange(BaseModel):
+    old_password: str
+    new_password: str = Field(..., min_length=6, max_length=100)
+
+
+class UserSearchResult(BaseModel):
+    id: str
+    username: str
+    avatar_url: str | None = None
+    bio: str | None = None
+    status: str = "offline"
+
+    model_config = {"from_attributes": True}