🧹 Remove unused generateDemoIsland function

[Ap-0007]

🎯 What: Removed the unused generateDemoIsland function from lib/island-engine.ts.
💡 Why: This improves maintainability by removing dead code. A codebase search confirmed there are no references to this function outside of its definition.
✅ Verification: Ran npm run build && npm run lint to confirm no regressions and that the build passes cleanly.
✨ Result: A cleaner codebase with less dead code to maintain.

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PR created automatically by Jules for task 18120412077118946608 started by @Ap-0007

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Project	Deployment	Actions	Updated (UTC)
side_pro	Ready	Preview, Comment	May 18, 2026 1:03pm