feat: Add vips dependencies for sharp in backend Dockerfile

- Added `vips-dev` and `vips` to build and runtime dependencies.
- Updated installation process to ensure compilation of native modules during build.

backend/Dockerfile

@@ -5,8 +5,8 @@ FROM node:20-alpine AS builder
 
 WORKDIR /app
 
-# Install build dependencies for native modules (better-sqlite3)
-RUN apk add --no-cache python3 make g++
+# Install build dependencies for native modules (better-sqlite3, sharp)
+RUN apk add --no-cache python3 make g++ vips-dev
 
 # Install dependencies
 COPY package*.json ./
@@ -24,11 +24,14 @@ FROM node:20-alpine
 
 WORKDIR /app
 
-# Install runtime dependencies (git for simple-git, sqlite3 CLI tool)
-RUN apk add --no-cache git sqlite
+# Install runtime dependencies (git for simple-git, sqlite3 CLI tool, vips for sharp)
+RUN apk add --no-cache git sqlite vips python3 make g++ vips-dev
 
-# Copy production dependencies from builder (already compiled native modules)
-COPY --from=builder /app/node_modules ./node_modules
+# Copy package files first
+COPY --from=builder /app/package*.json ./
+
+# Install production dependencies (will compile native modules in this stage)
+RUN npm ci --omit=dev || npm install --production
 
 # Copy built files from builder
 COPY --from=builder /app/dist ./dist