feat: adjust max and step values for sharpen, edgeThreshold, and scanlines controls.

Dockerfile

@@ -1,10 +1,17 @@
+# Build stage
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+# Runtime stage
 FROM node:22-alpine AS runtime
 WORKDIR /app
-
-COPY . .
-
-RUN npm install
-RUN npm run build
+COPY --from=build /app/dist ./dist
+COPY --from=build /app/package*.json ./
+COPY --from=build /app/node_modules ./node_modules
 
 ENV HOST=0.0.0.0
 ENV PORT=4321