[FEATURE] Complete documentation and guides

[altsang]

Description

Create comprehensive documentation including user guides, API documentation, and developer resources.

Technical Requirements

• User documentation and guides
• API documentation (OpenAPI/Swagger)
• Developer documentation and contributing guides
• Installation and setup documentation
• Troubleshooting and FAQ sections

Acceptance Criteria

• Complete user documentation with examples
• API documentation auto-generated from code
• Developer guides for contributing
• Installation guides for all platforms
• Troubleshooting guides and FAQ
• Documentation website or wiki

Implementation Notes

• Use Sphinx or MkDocs for documentation generation
• Include interactive API documentation
• Add video tutorials for complex workflows
• Implement documentation testing and validation

Related Issues

• Part of epic: Phase 6 Epic ([EPIC] Phase 6: Documentation & Release #6)
• Depends on: Phase 5 Epic ([EPIC] Phase 5: Advanced Features #5)