feat(监控): 完善系统监控、登录状态与访问审计能力

backend/app/schemas/user.py

@@ -6,6 +6,7 @@ from typing import Literal, Optional
 from pydantic import BaseModel, ConfigDict, EmailStr, Field, field_validator
 
 UserStatus = Literal["PENDING", "ACTIVE", "REJECTED", "DISABLED"]
+LoginStatus = Literal["ONLINE", "OFFLINE"]
 
 PASSWORD_REGEX = re.compile(r"^(?=.*[A-Za-z])(?=.*\d).{8,}$")
 
@@ -60,6 +61,11 @@ class UserRead(BaseModel):
     approved_at: Optional[datetime] = None
     approved_by: Optional[uuid.UUID] = None
     avatar_url: Optional[str] = None
+    login_status: LoginStatus = "OFFLINE"
+    last_login_at: Optional[datetime] = None
+    last_seen_at: Optional[datetime] = None
+    last_client_type: Optional[Literal["web", "desktop"]] = None
+    active_session_count: int = 0
 
     model_config = ConfigDict(from_attributes=True)
 
@@ -78,6 +84,19 @@ class UserResponse(UserRead):
     pass
 
 
+class UserLoginActivityRead(BaseModel):
+    id: uuid.UUID
+    client_type: Literal["web", "desktop"]
+    client_platform: Optional[str] = None
+    client_version: Optional[str] = None
+    login_at: datetime
+    last_seen_at: datetime
+    ended_at: Optional[datetime] = None
+    end_reason: Optional[str] = None
+
+    model_config = ConfigDict(from_attributes=True)
+
+
 class UserSelfUpdate(_PasswordValidator):
     full_name: Optional[str] = None
     clinical_department: Optional[str] = None