Add Hex Data Transcoder Page

[rtech-technologies]

This change implements a new utility page converter.html that allows users to convert images to a stream of hex codes and vice versa. This is designed for OS*2 terminal asset management. The page adheres to the RTECH industrial aesthetic, using JetBrains Mono, Lime-500 accents, and a dark terminal theme.

Key Features:

• Image to Hex: Extracts pixel data from uploaded images, downscales them to a maximum of 64x64 for performance, and serializes them as hex strings.
• Hex to Image: Reconstructs an image on a canvas from a list of hex codes (supporting various delimiters and formats), with a downloadable PNG output.
• Navigation: Added a /Converter link to the main navigation across the site.
• Verification: Includes full frontend verification with screenshots and video, ensuring high-contrast UI and functional conversion logic.

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PR created automatically by Jules for task 9193214494272916298 started by @rtech-technologies

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