feat: server-side EPUB-to-XTC conversion

.gitignore

@@ -42,3 +42,6 @@ next-env.d.ts
 
 # library data
 /data
+
+# git worktrees
+.worktrees/

Dockerfile

@@ -33,13 +33,22 @@ RUN addgroup --system --gid 1001 nodejs && \
     mkdir -p /data/library && \
     chown -R nextjs:nodejs /data
 
+# System libs for node-canvas (Cairo/Pango)
+RUN apk add --no-cache cairo pango libjpeg-turbo giflib
+
 # Copy standalone output
 COPY --from=builder /app/.next/standalone ./
 COPY --from=builder /app/.next/static ./.next/static
 COPY --from=builder /app/public ./public
 
-# Copy better-sqlite3 native binding (prebuilt .node binary)
-COPY --from=builder /app/node_modules/better-sqlite3 ./node_modules/better-sqlite3
+# Copy all node_modules (pnpm symlink structure requires full copy)
+COPY --from=builder /app/node_modules ./node_modules
+
+# Copy conversion worker source, shared libs, and dependencies
+COPY --from=builder /app/src/worker ./src/worker
+COPY --from=builder /app/src/lib ./src/lib
+COPY --from=builder /app/src/contexts ./src/contexts
+COPY --from=builder /app/tsconfig.json ./tsconfig.json
 
 VOLUME /data
 
@@ -48,6 +57,7 @@ EXPOSE 3000
 COPY <<'EOF' /entrypoint.sh
 #!/bin/sh
 chown -R nextjs:nodejs /data
+su-exec nextjs npx tsx src/worker/convert.ts &
 exec su-exec nextjs node server.js
 EOF
 RUN apk add --no-cache su-exec && chmod +x /entrypoint.sh