Refactor company domain by removing customer-related fields and methods

- Removed OwnerCustomerID from Company entity and CompanyResponse to streamline ownership representation.
- Eliminated customer assignment fields from CreateCompanyForm and ListCompaniesForm for clarity.
- Updated repository and service methods to remove GetByCustomerID and CountWithCustomer, simplifying the codebase.
- Adjusted Search method parameters to exclude hasCustomer filter, enhancing search functionality.
- Improved API documentation by removing references to customer assignment in handler comments.

internal/company/entity.go

@@ -65,9 +65,6 @@ type Company struct {
 	Currency string `bson:"currency" json:"currency"` // Default: "USD"
 	Timezone string `bson:"timezone" json:"timezone"` // Default: "UTC"
 
-	// Company ownership - which customer owns this company
-	OwnerCustomerID *string `bson:"owner_customer_id,omitempty" json:"owner_customer_id,omitempty"`
-
 	// Audit fields
 	CreatedBy *string `bson:"created_by,omitempty" json:"created_by,omitempty"`
 	UpdatedBy *string `bson:"updated_by,omitempty" json:"updated_by,omitempty"`
@@ -167,7 +164,6 @@ type CompanyResponse struct {
 	Language           string         `json:"language"`
 	Currency           string         `json:"currency"`
 	Timezone           string         `json:"timezone"`
-	OwnerCustomerID    *string        `json:"owner_customer_id,omitempty"`
 	CreatedAt          int64          `json:"created_at"`
 	UpdatedAt          int64          `json:"updated_at"`
 	CreatedBy          *string        `json:"created_by,omitempty"`
@@ -200,7 +196,6 @@ func (c *Company) ToResponse() *CompanyResponse {
 		Language:           c.Language,
 		Currency:           c.Currency,
 		Timezone:           c.Timezone,
-		OwnerCustomerID:    c.OwnerCustomerID,
 		CreatedAt:          c.CreatedAt,
 		UpdatedAt:          c.UpdatedAt,
 		CreatedBy:          c.CreatedBy,