重构代码库

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难度：高级

适用场景：Codebases with dead code, oversized modules, duplicated logic, or stale abstractions that make routine edits expensive. Teams that need to modernize code in place without turning the work into a framework or stack migration.

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Modernize and refactor this codebase. Requirements:

• Preserve behavior unless I explicitly ask for a functional change.
• Start by identifying dead code, duplicated paths, oversized modules, stale abstractions, and legacy patterns that are slowing changes down.
• For each proposed pass, name the current behavior, the structural improvement, and the validation check that should prove behavior stayed stable.
• Break the work into small reviewable refactor passes such as deleting dead code, s...