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<类型>(<范围>): <主题>
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<正文>
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<脚注>

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feat(search): add autocomplete suggestions
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Implement real-time suggestions for search input field.
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Fetch top 5 matching results from backend API as user types.
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Enhance UX with keyboard navigation support.
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Closes #101

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fix(auth): resolve session timeout crash
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Fix bug where app crashes on session expiration.
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Add null check for expired token and redirect to login page.
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Ref #89

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docs(api): update endpoint documentation
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Add details for new POST /users endpoint in API spec.
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Include request/response examples and error codes.

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style(css): reformat stylesheets with consistent spacing
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Apply 2-space indentation across all CSS files.
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Align properties alphabetically for better readability.

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refactor(cart): extract discount logic to separate module
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Move discount calculation from Cart class to DiscountUtil.
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Improve code modularity and testability.

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test(payment): add integration tests for checkout flow
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Cover successful payment and failure scenarios.
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Mock third-party payment gateway responses.

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chore(deps): update react to v18.2.0
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Upgrade React dependency in package.json.
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Run tests to ensure compatibility with existing components.

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perf(api): cache frequent database queries
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Add Redis caching layer for user profile lookups.
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Reduce average response time by 30% for GET /users/:id.

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ci: configure deployment pipeline in CircleCI
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Add deploy step to push production builds to AWS.
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Set up environment variables for secure credentials.

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revert: undo feat(search): add autocomplete suggestions
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Revert commit abc123 due to performance issues with large datasets.
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Restore previous search behavior until optimization is ready.