- Only the catalog is updated. No existing links are changed
- Move 'AI Concepts' under 'Overview'
- Reorganize API sections for better hierarchy
- Move 'Vector Databases' into its own top-level section
- Reposition 'Function Calling', 'Multimodality', 'Testing', and 'Structured Output' as top-level items
- Remove redundant nesting in some sections
- Comment out 'Generic Model' section
- Rename AI Model API into AI Models
- Get rid of the API suffix
- Improve Multimodality doc
- Update feature listing
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