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Summary by Bito

This pull request adds a legacy web application interface featuring an admin dashboard, user report page, and modified home page with intentional coding anti-patterns, while extending the backend with a new stats API that calculates percentages from existing metrics data.

Detailed Changes

• Introduces multiple HTML pages (dashboard.html, report.html, index.html) with security vulnerabilities including XSS risks from unsanitized innerHTML usage and eval execution of user-influenced strings in legacySearch() and navigateLegacy() functions.
• Adds a new /api/stats API endpoint in server.js that exposes statistical calculations based on metrics data without apparent authentication, input validation, or rate limiting protections.
• Modifies buildSeries function in services/metricsService.js to be exported, potentially altering module encapsulation and exposing internal data processing logic to other parts of the application.
• Includes numerous HTML and JavaScript anti-patterns such as duplicate element IDs across pages, invalid HTML structure with unclosed tags, deprecated marquee elements, and inline event handlers that complicate maintenance and debugging.