🧹 [Code Health] Refactor autoInfer.ts nested logic

[seonghobae]

🎯 What: Simplified nested loops into a modern functional paradigm using flatMap and filter in frontend/src/erd/autoInfer.ts. Removed the obsolete TODO block.

💡 Why: Significantly improves code readability and maintainability by reducing the function length from over 100 lines down to roughly 45 lines, all while preserving O(N) lookup optimization via Map.

✅ Verification: Ran pnpm run test autoInfer to ensure 100% logic preservation against the existing test suite (src/erd/__tests__/autoInfer.test.ts), passing all assertions. Also ran pnpm run lint successfully.

✨ Result: A more concise, readable, and functional logic layer that accomplishes exactly what the TODO aimed for while keeping the codebase tight.

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PR created automatically by Jules for task 8896537017281638491 started by @seonghobae

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📥 Commits

Reviewing files that changed from the base of the PR and between 72afe6d and 8435ba1.

📒 Files selected for processing (1)

• frontend/src/erd/autoInfer.ts

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