update docker file

frontend/dockerfile

@@ -1,15 +1,14 @@
-FROM oven/bun:1 AS build-stage
+# Build stage — use Node to correctly install native deps
+FROM node:22-alpine AS build-stage
 WORKDIR /app
 
-# Allow native module installs (sharp needs this)
-ENV BUN_CONFIG_NO_NATIVE_INSTALLS=0
-
-COPY package.json bun.lockb* ./
-RUN bun install --frozen-lockfile && bun add sharp --platform=linux --arch=x64
+COPY package*.json ./
+RUN npm ci --os=linux --cpu=x64
 
 COPY . .
-RUN bun run build
+RUN npm run build
 
+# Run stage — use Bun for serving
 FROM oven/bun:1 AS production-stage
 WORKDIR /app
 COPY --from=build-stage /app /app