No canonical snake_case/camelCase serialization policy

backend/app/models/setup.py

@@ -3,14 +3,13 @@
 Request, response, and domain models for the first-run configuration wizard.
 """
 
-from pydantic import BaseModel, ConfigDict, Field, field_validator
+from pydantic import Field, field_validator
 
+from app.models.response import BanGuiBaseModel
 
-class SetupRequest(BaseModel):
+class SetupRequest(BanGuiBaseModel):
     """Payload for ``POST /api/setup``."""
 
-    model_config = ConfigDict(strict=True)
-
     master_password: str = Field(
         ...,
         min_length=8,
@@ -53,30 +52,21 @@ class SetupRequest(BaseModel):
         description="Number of minutes a user session remains valid.",
     )
 
-
-class SetupResponse(BaseModel):
+class SetupResponse(BanGuiBaseModel):
     """Response returned after a successful initial setup."""
 
-    model_config = ConfigDict(strict=True)
-
     message: str = Field(
         default="Setup completed successfully. Please log in.",
     )
 
-
-class SetupTimezoneResponse(BaseModel):
+class SetupTimezoneResponse(BanGuiBaseModel):
     """Response for ``GET /api/setup/timezone``."""
 
-    model_config = ConfigDict(strict=True)
-
     timezone: str = Field(..., description="Configured IANA timezone identifier.")
 
-
-class SetupStatusResponse(BaseModel):
+class SetupStatusResponse(BanGuiBaseModel):
     """Response indicating whether setup has been completed."""
 
-    model_config = ConfigDict(strict=True)
-
     completed: bool = Field(
         ...,
         description="``True`` if the initial setup has already been performed.",