chore: add prefer-numeric-literals ESLint rule

[devin-ai-integration]

Add prefer-numeric-literals ESLint rule

This PR adds the prefer-numeric-literals ESLint rule set to "error" as requested in Slack channel #shortest.

Changes

• Added the prefer-numeric-literals rule to eslint.config.js

Testing

• Verified the rule was added correctly by running lint checks
• No code changes were needed as the codebase already follows this rule

Link to Devin run: https://app.devin.ai/sessions/8ac195f3effa48029307adc71d0d1699
Requested by: Razvan Marescu (razvan@marescu.net)

[devin-ai-integration]

Original prompt from Razvan:

Received message in Slack channel #shortest:

@Devin, for antiwork/shortest, add the following eslint rule: "prefer-numeric-literals": "error"

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Name	Status	Preview	Comments	Updated (UTC)
shortest	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 1, 2025 3:31am

[devin-ai-integration]

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