fix: Dockerfile - add node-gyp for sharp compilation

Dockerfile

@@ -6,21 +6,25 @@ FROM node:22-alpine AS builder
 # Install system dependencies for sharp and pdf processing
 RUN apk add --no-cache \
     python3 \
+    py3-pip \
     make \
     g++ \
+    gcc \
+    libc-dev \
+    vips-dev \
     poppler-utils \
-    vips-dev
+    pkgconfig
 
 WORKDIR /app
 
-# Install pnpm
-RUN npm install -g pnpm@10.4.1
+# Install pnpm and node-gyp globally
+RUN npm install -g pnpm@10.4.1 node-gyp
 
 # Copy package files
 COPY package.json pnpm-lock.yaml ./
 COPY patches/ ./patches/
 
-# Install dependencies
+# Install dependencies (with node-gyp available)
 RUN pnpm install --frozen-lockfile
 
 # Copy source code
@@ -42,15 +46,18 @@ RUN apk add --no-cache \
 
 WORKDIR /app
 
-# Install pnpm for production deps
+# Install pnpm
 RUN npm install -g pnpm@10.4.1
 
 # Copy package files
 COPY package.json pnpm-lock.yaml ./
 COPY patches/ ./patches/
 
-# Install production dependencies only
-RUN pnpm install --frozen-lockfile --prod
+# Install production dependencies only (no build tools needed for prod deps)
+RUN apk add --no-cache python3 make g++ gcc libc-dev vips-dev pkgconfig && \
+    npm install -g node-gyp && \
+    pnpm install --frozen-lockfile --prod && \
+    apk del make g++ gcc libc-dev pkgconfig
 
 # Copy built assets from builder
 COPY --from=builder /app/dist ./dist