Stabilize Hugging Face npm install

Dockerfile

@@ -15,12 +15,16 @@ RUN pip3 install --no-cache-dir yt-dlp
 # Set the working directory
 WORKDIR /app
 
+# Keep npm behavior deterministic in CI/container builds
+ENV NPM_CONFIG_LEGACY_PEER_DEPS=true
+ENV CI=true
+
 # Copy package management files
 COPY package*.json ./
 COPY web/package*.json ./web/
 
-# Install ALL dependencies (including devDependencies needed for build)
-RUN npm install --legacy-peer-deps
+# Install ALL dependencies from the lockfile (including devDependencies needed for build)
+RUN npm ci
 
 # Copy the rest of the application code
 COPY . .