Axum-based REST API that mirrors Tauri IPC commands, sharing the same
ImageStore via Arc. Endpoints for image open/list/close/save, stats/histogram/
pixel inspection, operations (invert, blur, threshold, edge detection, FFT,
projections, etc.), undo, and PNG tile rendering. Auto-starts on port 8787
alongside Tauri GUI. Standalone headless binary via `cargo run --bin ri-headless`.
CORS enabled for browser-based clients. 75 tests passing.
Co-Authored-By: Claude Opus 4.6 <[email protected]>