docs: add RepoCloud one-click deploy button

[cosark]

Summary

Adds a RepoCloud one-click deploy button to the README, placed in a new "☁️ One-Click Deploy" section between Benchmarks and Contributing.

• New ## ☁️ One-Click Deploy section with deploy button
• Button links to https://repocloud.io/details/TrueForge/

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Note

Low Risk
Documentation-only README change with no code, config, or deployment logic affected.

Overview
Adds a ☁️ One-Click Deploy section to the README between Benchmarks and Contributing, with a RepoCloud deploy badge that links to https://repocloud.io/details/TrueForge/.

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[changeset-bot]

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Latest commit: 80e47fa

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