Image Compression Service

A lightweight backend service written in Go that processes images on-the-fly through URL pattern routing. Supports resizing, smart crop (region of interest detection), manual crop, horizontal flip, and a chainable filter pipeline including grayscale, blur, brightness, and contrast adjustments. Output can be served in JPEG, PNG, or WebP format with configurable quality. Features a 2-layer caching system (in-memory via sync.Map + disk) using MD5 hashing as cache keys to minimize redundant processing.