feat: SOTA AI photo colorization with DDColor deep learning model (#57) (#58)

Add AI-powered photo colorization that converts B&W/grayscale images to
full color using DDColor (ICCV 2023 dual-decoder architecture) via ONNX
Runtime. Includes model selection (Auto/DDColor/Classic), adjustable color
intensity, batch processing, before/after preview, and full HEIC/HEIF support.

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

apps/web/src/lib/tool-registry.tsx

@@ -244,6 +244,11 @@ const ImageEnhancementSettings = lazy(() =>
     default: m.ImageEnhancementSettings,
   })),
 );
+const ColorizeSettings = lazy(() =>
+  import("@/components/tools/colorize-settings").then((m) => ({
+    default: m.ColorizeSettings,
+  })),
+);
 
 // ── Color tool wrapper ─────────────────────────────────────────────
 // Color tools share a single component but differ by toolId.
@@ -372,6 +377,7 @@ export const toolRegistry = new Map<string, ToolRegistryEntry>([
       Settings: ImageEnhancementSettings as never,
     },
   ],
+  ["colorize", { displayMode: "before-after", Settings: ColorizeSettings }],
 ]);
 
 export function getToolRegistryEntry(toolId: string): ToolRegistryEntry | undefined {