Implement Clarifai AI adapter

[op-simoneromeo]

Summary

• replace the Clarifai placeholder with Clarifai's documented OpenAI-compatible chat-completions endpoint
• use CLARIFAI_PAT, current Clarifai model URLs, dry-run behavior, custom baseUrl, usage mapping, and provider error excerpts
• add mocked tests for request shape, dry-run, compatible text fallback, and errors

Validation

• pnpm vitest run packages/ai/clarifai/src/index.test.ts
• pnpm --filter @profullstack/sh1pt-ai-clarifai typecheck
• pnpm --filter @profullstack/sh1pt-ai-clarifai build
• git diff --check
• secret-pattern scan over packages/ai/clarifai found no matches

Docs used: https://docs.clarifai.com/compute/inference/open-ai/

No real Clarifai PAT or other secret was used or committed.

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[github-actions]

🤖 Auto-rebase: The branch was rebased successfully locally but could not be pushed to the fork. Please enable 'Allow edits from maintainers' in the PR settings, or rebase manually: git fetch upstream master && git rebase upstream/master.

[github-actions]

🤖 Auto-rebase: The branch was rebased successfully locally but could not be pushed to the fork. Please enable 'Allow edits from maintainers' in the PR settings, or rebase manually: git fetch upstream master && git rebase upstream/master.

[github-actions]

🤖 Auto-rebase: The branch was rebased successfully locally but could not be pushed to the fork. Please enable 'Allow edits from maintainers' in the PR settings, or rebase manually: git fetch upstream master && git rebase upstream/master.

[github-actions]

🤖 Auto-rebase: The branch was rebased successfully locally but could not be pushed to the fork. Please enable 'Allow edits from maintainers' in the PR settings, or rebase manually: git fetch upstream master && git rebase upstream/master.