feat(noise-removal): SOTA noise removal with 4 quality tiers (#57)

* feat(noise-removal): register tool in shared constants and i18n

* feat(noise-removal): add SCUNet and NAFNet model architectures

* feat(noise-removal): add Python denoising engine with 4 quality tiers

* feat(noise-removal): add TypeScript bridge for Python sidecar

* feat(noise-removal): add frontend settings with 4-tier selector

* feat(noise-removal): register in tool registry and pipeline

* feat(noise-removal): add Fastify API route with Zod validation

* feat(noise-removal): add SCUNet and NAFNet model downloads to Docker build

* test(noise-removal): add to e2e tool page rendering tests

* test(noise-removal): add integration tests for API endpoint

* style: fix biome formatting and import ordering

* fix(noise-removal): use correct model download URLs

NAFNet model is hosted on HuggingFace, not GitHub releases.
Also align SCUNet URL to use the KAIR releases (same as Docker build).

* fix(noise-removal): remove emojis from tier selector, simplify labels

Drop emoji icons from Quick/Balanced/Quality/Maximum buttons. Replace
technical algorithm names with plain descriptions users can understand.

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Co-authored-by: stirling-image <stirling-image@users.noreply.github.com>

tests/e2e/tools-all.spec.ts

@@ -40,6 +40,7 @@ const TOOLS_WITH_DROPZONE = [
   { id: "svg-to-raster", name: "SVG to Raster" },
   { id: "vectorize", name: "Image to SVG" },
   { id: "gif-tools", name: "GIF" },
+  { id: "noise-removal", name: "Noise Removal" },
 ];
 
 const TOOLS_WITHOUT_DROPZONE = [{ id: "qr-generate", name: "QR Code" }];