Add contractors by residence endpoint and Bruno API collection

- Add GET /contractors/by-residence/:residence_id/ endpoint
- Create comprehensive Bruno API collection (89 endpoints)
- Collection covers all API endpoints with Local and Dev environments

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/services/contractor_service.go

@@ -294,6 +294,25 @@ func (s *ContractorService) GetContractorTasks(contractorID, userID uint) ([]res
 	return responses.NewTaskListResponse(tasks), nil
 }
 
+// ListContractorsByResidence lists all contractors for a specific residence
+func (s *ContractorService) ListContractorsByResidence(residenceID, userID uint) ([]responses.ContractorResponse, error) {
+	// Check user has access to the residence
+	hasAccess, err := s.residenceRepo.HasAccess(residenceID, userID)
+	if err != nil {
+		return nil, err
+	}
+	if !hasAccess {
+		return nil, ErrResidenceAccessDenied
+	}
+
+	contractors, err := s.contractorRepo.FindByResidence(residenceID)
+	if err != nil {
+		return nil, err
+	}
+
+	return responses.NewContractorListResponse(contractors), nil
+}
+
 // GetSpecialties returns all contractor specialties
 func (s *ContractorService) GetSpecialties() ([]responses.ContractorSpecialtyResponse, error) {
 	specialties, err := s.contractorRepo.GetAllSpecialties()