Remove company_id field from user-related forms and documentation

- Deleted the company_id field from CreateUserForm, User entity, and related API documentation in Swagger and YAML files to streamline user creation process.
- Updated the CreateUser service method to reflect the removal of company_id, ensuring consistency across the user management functionality.

internal/user/service.go

@@ -73,12 +73,6 @@ func (s *userService) CreateUser(ctx context.Context, form *CreateUserForm, crea
 		return nil, errors.New("failed to process password")
 	}
 
-	// Parse optional fields
-	var companyID *string
-	if form.CompanyID != nil {
-		companyID = form.CompanyID
-	}
-
 	// Validate role
 	role := UserRole(form.Role)
 	if !s.validator.IsValidRole(role) {
@@ -93,7 +87,6 @@ func (s *userService) CreateUser(ctx context.Context, form *CreateUserForm, crea
 		Password:     string(hashedPassword),
 		Role:         role,
 		Status:       UserStatusActive,
-		CompanyID:    companyID,
 		Department:   form.Department,
 		Position:     form.Position,
 		Phone:        form.Phone,
@@ -168,17 +161,11 @@ func (s *userService) Login(ctx context.Context, form *LoginForm) (*AuthResponse
 		})
 	}
 
-	// Generate JWT tokens using authorization service
-	companyID := ""
-	if user.CompanyID != nil {
-		companyID = *user.CompanyID
-	}
-
 	tokenPair, err := s.authService.GenerateTokenPair(
 		user.ID.Hex(),
 		user.Email,
 		string(user.Role),
-		companyID,
+		"",
 	)
 	if err != nil {
 		s.logger.Error("Failed to generate JWT tokens", map[string]interface{}{
@@ -443,10 +430,6 @@ func (s *userService) UpdateUser(ctx context.Context, id string, form *UpdateUse
 		user.Role = role
 	}
 
-	if form.CompanyID != nil {
-		user.CompanyID = form.CompanyID
-	}
-
 	if form.Department != nil {
 		user.Department = form.Department
 	}