docs(ecosystem): Add react-f3

[maanlamp]

This PR adds react-f3 to the ecosystem documentation.

React-f3 is some sort of "spiritual successor" to react-zorm which seems to be abandoned.

[coderabbitai]

Walkthrough

A new form library resource entry was added to the formIntegrations list in the ecosystem documentation component. The addition includes react-f3, a React-based form toolkit package, along with its npm URL and a brief description. The entry includes the necessary metadata fields (name, URL, description, and repository slug) to integrate with the existing documentation structure. No functional logic, control flow, or other components were modified as part of this change.

Pre-merge checks

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding react-f3 to the ecosystem documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The PR description clearly relates to the changeset, explaining that react-f3 is being added to ecosystem documentation as a spiritual successor to react-zorm.

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