v3.18.1

[mrubens]

Important

Add support for new Claude models, switch to monorepo, and fix README gif display.

• Models: Add support for Claude Sonnet 4 and Claude Opus 4 models with thinking variants.
• Codebase: Switch to a monorepo structure and create an automated "nightly" build.
• Documentation: Fix README gif display in all localized versions.

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