refactor: decompose app.js into focused modules#66
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Extract SSRF/network validation, HTTP fetching, and error handling from the 530-line app.js god-module into dedicated modules (network.js, fetcher.js, errors.js). Inline trivial logger.js. Add statusCode and toResponseBody() to FetchArticleError, eliminating the 3-function error normalization chain. app.js now ~170 lines of routing and parsing orchestration. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Use static '%s' format strings instead of embedding user-controlled url into template literals that become the first argument to console methods. This prevents format specifiers in user input from being interpreted by util.format.
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Extract SSRF/network validation, HTTP fetching, and error handling from the 530-line app.js god-module into dedicated modules (network.js, fetcher.js, errors.js). Inline trivial logger.js. Add statusCode and toResponseBody() to FetchArticleError, eliminating the 3-function error normalization chain. app.js now ~170 lines of routing and parsing orchestration.