fix: update outdated CrewAI Toolkit links in docs (fixes #5253)

[devin-ai-integration]

Summary

Replaces all references to the deprecated personal repo URL (github.com/joaomdmoura/crewai-tools) with the current monorepo location (github.com/crewAIInc/crewAI/tree/main/lib/crewai-tools) across all 4 language versions of the docs (en, ko, ar, pt-BR). Affected files: agents.mdx, tasks.mdx, and tools.mdx in each locale — 12 files total.

Adds a regression test (lib/crewai/tests/test_docs_links.py) that scans all .mdx files for the deprecated URL to prevent this from recurring.

Fixes #5253

Review & Testing Checklist for Human

• Verify the new link https://github.com/crewAIInc/crewAI/tree/main/lib/crewai-tools resolves correctly
• Spot-check a couple of the localized doc files (ar, ko, pt-BR) to confirm the links render properly in markdown context
• Note: test_crewai_toolkit_links_use_correct_url uses a regex matching CrewAI.*Toolkit in link text, which won't match localized link text (e.g., Arabic مجموعة أدوات CrewAI). The first test (test_no_deprecated_crewai_tools_link) does a plain string search and covers all languages. Decide if the second test's partial coverage is acceptable or if it should be adjusted.

Notes

• Changelog entries referencing @joaomdmoura as an author attribution were intentionally left unchanged — those are accurate historical records, not links to the old repo.
• The ko/concepts/tools.mdx diff includes a trailing newline fix (missing EOF newline).

Link to Devin session: https://app.devin.ai/sessions/8f3a0917988f4a48846744a720484b0f

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Note

Low Risk
Low risk: documentation-only link updates plus a new test that scans .mdx files for deprecated URLs; no runtime code paths are affected beyond CI test coverage.

Overview
Updates all docs references to the CrewAI Toolkit repo from github.com/joaomdmoura/crewai-tools to the monorepo location github.com/crewAIInc/crewAI/tree/main/lib/crewai-tools across multiple locales (e.g., agents.mdx, tasks.mdx, tools.mdx).

Adds lib/crewai/tests/test_docs_links.py, a pytest suite that walks the docs/ tree to fail CI on deprecated toolkit URLs and to validate that markdown links labeled CrewAI Toolkit point at the correct monorepo URL.

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