fix: use node:22-bookworm (Debian) instead of Alpine for sharp compatibility

Dockerfile

@@ -1,30 +1,29 @@
 # ============================================================
 # STAGE 1: Build Frontend + Backend
 # ============================================================
-FROM node:22-alpine AS builder
+FROM node:22-bookworm AS builder
 
 # Install system dependencies for sharp and pdf processing
-RUN apk add --no-cache \
+RUN apt-get update && apt-get install -y \
     python3 \
-    py3-pip \
     make \
     g++ \
     gcc \
-    libc-dev \
-    vips-dev \
+    libvips-dev \
     poppler-utils \
-    pkgconfig
+    pkg-config \
+    && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 
-# Install pnpm and node-gyp globally
+# Install pnpm globally
 RUN npm install -g pnpm@10.4.1 node-gyp
 
 # Copy package files
 COPY package.json pnpm-lock.yaml ./
 COPY patches/ ./patches/
 
-# Install ALL dependencies (including devDeps for build)
+# Install dependencies
 RUN pnpm install --frozen-lockfile
 
 # Copy source code
@@ -36,13 +35,14 @@ RUN pnpm build
 # ============================================================
 # STAGE 2: Production image
 # ============================================================
-FROM node:22-alpine AS production
+FROM node:22-bookworm-slim AS production
 
-# Install runtime dependencies only (vips for sharp, poppler for PDF)
-RUN apk add --no-cache \
+# Install runtime dependencies only
+RUN apt-get update && apt-get install -y \
     poppler-utils \
-    vips \
-    curl
+    libvips42 \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app