added data models

src/baby_monitor/models/auth.py

@@ -0,0 +1,19 @@
+"""Authentication models for request and response validation."""
+
+from pydantic import BaseModel
+
+
+class LoginRequest(BaseModel):
+    """Request model for user login."""
+
+    username: str
+    password: str
+
+
+class LoginResponse(BaseModel):
+    """Response model for successful login."""
+
+    message: str
+    username: str
+    access_token: str
+    token_type: str = "bearer"