Refactor user endpoint tests to include pagination and response structure validation

- Updated tests for listing users to validate pagination and response format.
- Changed mock return values to include total count and pagination details.
- Refactored user creation mocks for clarity and consistency.
- Enhanced assertions to check for presence of pagination fields in responses.
- Adjusted test cases for user retrieval and updates to ensure proper handling of user data.
- Improved readability by restructuring mock definitions and assertions across various test files.

app/schemas/auth.py

@@ -85,7 +85,8 @@ class ChangePasswordRequest(BaseModel):
     """Schema for password change request."""
 
     current_password: str | None = Field(
-        None, description="Current password (required if user has existing password)",
+        None,
+        description="Current password (required if user has existing password)",
     )
     new_password: str = Field(
         ...,
@@ -98,5 +99,8 @@ class UpdateProfileRequest(BaseModel):
     """Schema for profile update request."""
 
     name: str | None = Field(
-        None, min_length=1, max_length=100, description="User display name",
+        None,
+        min_length=1,
+        max_length=100,
+        description="User display name",
     )