Update Slither trophies

[TUPM96]

Summary

• Add post-Jun-2021 public audit reports that explicitly mention Slither-reported findings.
• Keep the trophies table in chronological order.

Fixes #1635

Sources

• https://certificate.quantstamp.com/full/api-3.pdf
• https://certificate.quantstamp.com/full/keeper-dao-liquidity-pool-and-hiding-vault.pdf
• https://certificate.quantstamp.com/full/cryptex.pdf
• https://certificate.quantstamp.com/full/fodl.pdf

Testing

• codespell trophies.md
• git diff --check

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the security “trophies” list by adding additional audited projects/vulnerabilities from mid–late 2021.

Changes:

• Added new trophy entries for API3, KeeperDAO, Cryptex, and FODL.
• Expanded the list with additional vulnerability categories (e.g., upgradeable initializer, state variable shadowing, contract locking ether).

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