Refactor User Response Handling in API Endpoints

- Updated user-related API handlers to return user entities directly instead of using the ToResponse method, simplifying response structures.
- Modified service methods to return UserResponse types instead of User, enhancing consistency in response formats.
- Improved pagination handling in the response package by setting default values for sorting parameters, ensuring more predictable behavior in API responses.

internal/user/handler.go

@@ -137,7 +137,7 @@ func (h *Handler) GetProfile(c echo.Context) error {
 		return response.NotFound(c, "User not found")
 	}
 
-	return response.Success(c, user.ToResponse(), "Profile retrieved successfully")
+	return response.Success(c, user, "Profile retrieved successfully")
 }
 
 // UpdateProfile updates current user profile
@@ -172,7 +172,7 @@ func (h *Handler) UpdateProfile(c echo.Context) error {
 		return response.BadRequest(c, err.Error(), "")
 	}
 
-	return response.Success(c, user.ToResponse(), "Profile updated successfully")
+	return response.Success(c, user, "Profile updated successfully")
 }
 
 // ChangePassword changes current user password
@@ -276,7 +276,7 @@ func (h *Handler) CreateUser(c echo.Context) error {
 		return response.BadRequest(c, err.Error(), "")
 	}
 
-	return response.Created(c, user.ToResponse(), "User created successfully")
+	return response.Created(c, user, "User created successfully")
 }
 
 // ListUsers lists users with search and filters (admin only)
@@ -342,7 +342,7 @@ func (h *Handler) GetUserByID(c echo.Context) error {
 		return response.NotFound(c, "User not found")
 	}
 
-	return response.Success(c, user.ToResponse(), "User retrieved successfully")
+	return response.Success(c, user, "User retrieved successfully")
 }
 
 // UpdateUser updates a user (admin only)
@@ -380,7 +380,7 @@ func (h *Handler) UpdateUser(c echo.Context) error {
 		return response.BadRequest(c, err.Error(), "")
 	}
 
-	return response.Success(c, user.ToResponse(), "User updated successfully")
+	return response.Success(c, user, "User updated successfully")
 }
 
 // DeleteUser deletes a user (admin only)