fix: Simplify Docker Node.js installation to use native Debian packages to avoid environment symlink errors

Dockerfile

@@ -1,20 +1,13 @@
-# Use multi-stage build to get Node.js binaries securely
-FROM node:20-slim AS node_base
-
 # Use Python 3.10 as base
 FROM python:3.10-slim
 
-# Copy Node.js from the official image
-COPY --from=node_base /usr/local/bin/node /usr/local/bin/
-COPY --from=node_base /usr/local/lib/node_modules /usr/local/lib/node_modules
-RUN ln -s /usr/local/bin/node /usr/local/bin/nodejs && \
-    ln -s /usr/local/lib/node_modules/npm/bin/npm-cli.js /usr/local/bin/npm && \
-    ln -s /usr/local/lib/node_modules/npm/bin/npx-cli.js /usr/local/bin/npx
-
-# Install system dependencies (ffmpeg for audio processing)
+# Install system dependencies (ffmpeg for audio processing, and Node.js/npm for frontend)
+# Debian Bookworm includes Node 18.19 natively, which satisfies Next.js 14 requirements.
 RUN apt-get update && apt-get install -y \
     ffmpeg \
     git \
+    nodejs \
+    npm \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*