- Replace single agent family KB upload endpoint with separate general and specific endpoints

- Add uploadGeneralAgentFamiliesKnowledgeBaseFiles for shared KB files across all agent families

- Add uploadSpecificAgentFamilyKnowledgeBaseFiles for family-specific KB files

- Add uploadMainN8NWorkflowTemplateForAgentFamily for workflow template management

- Add uploadKnowledgeDocumentsForSpecificAgent for individual agent KB documents

- Add uploadAgentMessageAttachments for agent conversation file attachments

- Add corresponding GET endpoints for retrieving all file types

- Add getMainN8NWorkflowTemplateContent endpoint to retrieve JSON workflow content

- Enhance API documentation with detailed operation descriptions for all new endpoints

- Improve endpoint organization with dedicated sections for upload and retrieval operations